US3368566A - Filter cigarette - Google Patents
Filter cigarette Download PDFInfo
- Publication number
- US3368566A US3368566A US375779A US37577964A US3368566A US 3368566 A US3368566 A US 3368566A US 375779 A US375779 A US 375779A US 37577964 A US37577964 A US 37577964A US 3368566 A US3368566 A US 3368566A
- Authority
- US
- United States
- Prior art keywords
- filter
- tobacco
- cigarette
- web
- filters
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 235000019504 cigarettes Nutrition 0.000 title description 23
- 241000208125 Nicotiana Species 0.000 description 18
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 18
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 239000000835 fiber Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 229920000297 Rayon Polymers 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- 230000000391 smoking effect Effects 0.000 description 4
- SNICXCGAKADSCV-JTQLQIEISA-N (-)-Nicotine Chemical compound CN1CCC[C@H]1C1=CC=CN=C1 SNICXCGAKADSCV-JTQLQIEISA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 239000000796 flavoring agent Substances 0.000 description 3
- 235000019634 flavors Nutrition 0.000 description 3
- 229960002715 nicotine Drugs 0.000 description 3
- SNICXCGAKADSCV-UHFFFAOYSA-N nicotine Natural products CN1CCCC1C1=CC=CN=C1 SNICXCGAKADSCV-UHFFFAOYSA-N 0.000 description 3
- 230000001473 noxious effect Effects 0.000 description 3
- 239000013618 particulate matter Substances 0.000 description 3
- 150000002989 phenols Chemical class 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- HGINCPLSRVDWNT-UHFFFAOYSA-N Acrolein Chemical compound C=CC=O HGINCPLSRVDWNT-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 2
- 239000005751 Copper oxide Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229920001617 Vinyon Polymers 0.000 description 2
- 229910021538 borax Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229910000431 copper oxide Inorganic materials 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 231100000206 health hazard Toxicity 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 235000019980 sodium acid phosphate Nutrition 0.000 description 2
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 2
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 2
- 239000001488 sodium phosphate Substances 0.000 description 2
- 229910000162 sodium phosphate Inorganic materials 0.000 description 2
- 235000011008 sodium phosphates Nutrition 0.000 description 2
- 239000004328 sodium tetraborate Substances 0.000 description 2
- 235000010339 sodium tetraborate Nutrition 0.000 description 2
- NKAAEMMYHLFEFN-ZVGUSBNCSA-M sodium;(2r,3r)-2,3,4-trihydroxy-4-oxobutanoate Chemical compound [Na+].OC(=O)[C@H](O)[C@@H](O)C([O-])=O NKAAEMMYHLFEFN-ZVGUSBNCSA-M 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000011269 tar Substances 0.000 description 2
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N chromium trioxide Inorganic materials O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 229940117975 chromium trioxide Drugs 0.000 description 1
- GAMDZJFZMJECOS-UHFFFAOYSA-N chromium(6+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+6] GAMDZJFZMJECOS-UHFFFAOYSA-N 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000000266 injurious effect Effects 0.000 description 1
- 230000000622 irritating effect Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/04—Tobacco smoke filters characterised by their shape or structure
-
- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
- A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
- A24D3/06—Use of materials for tobacco smoke filters
- A24D3/16—Use of materials for tobacco smoke filters of inorganic materials
Definitions
- ABSTRACT F THE DISCLOSURE The invention relates to a cigarette having a burnable charge of relativelyv inexpensive material, a composite filter having mechanical filtering means for removing particulate material and chemical reacting materials for removing some noxious gases from the gas stream and a terminal charge of relatively high quality tobacco at the mouth end of the cigarette for providing a tobacco flavor to the exiting gas stream.
- This invention relates to cigarettes and more especially to filter cigarettes.
- filter cigarettes have come into Widespread use by those who want to ⁇ enjoy the pleasure of smoking without incurring the health hazard, it is doubtful whether any of the currently available filter cigarettes actually eliminate the health hazard. It has been established that the extensive smoking of cigarettes is apparently a cause of certain ailments, but there is doubt as to what product or products of combustion of the cigarette are primarily injurious. 'Presently used :filters remove so little of the products of combustion that they may be completely useless.
- the toxic, irritating and noxious components produced by the combustion of the cigarette are removed by the filter before they enter the mouth of the smoker.
- These components include nicotine, acrolein, phenolic compounds, tars, organic acids, such as acetic acid, alcohols, ketones, esters and other hydrocarbons. It is believed that the removal of these components results in a safer cigarette.
- the pressure drop through the cigarette need not be significantly higher than that obtained with con ventional filter cigarettes.
- Another object is to provide a cigarette of the character indicated, with tobacco behind the filter for reconstituting the flavor, but this requires only a small amount of tobacco which does not burn and which is used to provide the aroma and taste that adds to the enjoyment of smoking for those who like to smoke.
- the tobacco which is to be burned may be a grade which is low in cost since the taste" of the burning tobacco is filtered out. Only a small amount of reconstituting tobacco behind the filter need be tobacco of high quality to provide a desirable taste and aroma carried by the n1trogen stream which the smoker draws into his mouth.
- the invention can be made with several short filters in series or with a single longer filter constituting the difterent ingredients required for accomplishing the new results of this invention.
- FIGURE 1 is a diagramm-atic sectional view of a cigarette made in accordance with this invention and having a series of short filters;
- FIGURE 2 is a view similar to FIGURE l but showing 3,368,566 Patented Feb. 13, 1968 a modified form of the invention in which a single filter replaces the plurality of filters shown in FIGURE 1.
- FIGURE 1 includes a cover 10, which is conventionally made of paper and a quantity of tobacco 12 packed in the front end of the cover in accordance with conventional practice.
- the tobacco 12 may be a blend, and may be made up partly or wholly of some of the tobacco substitutes which have been suggested and which for purposes of this invention are to be considered equivalent of tobacco.
- the first filter 14 is for the purpose of removing the solids that are present in the tobacco smoke, such as colloidal nicotine which is present as an aerosol suspension; carbon; and higher hydrocarbons (tars).
- This first filter 14 is a fine mesh web capable of mechanically removing small solid particles from the smoke.
- the filter 14 maybe made of a carded web, oriented, -200 grains per square yard, viscose fiber, 1.5 denier, 3A to 2 long. Or it may be a carded web, oriented, 150- 450 grains per square yard, viscose fiber, 1.5 denier to 3.0 denier, 1/2 to 2" long.
- a filter made with fibers of nylon, polyesters such yas Daeron, polyethylene, polypropylene, vinyon, acrylic such as Acrilan, Orlon or Creslan, or blends of any of these, is highly satisfactory. These fibers may also be used to make the web referred to below as a Rando-Webber web.
- the Rando-Webber web may have a composition as follows:
- the second -filter 16 removes condensible substances.
- This filter 16 contains activated carbon to which may be added, if desired, a quantity of silica gel. This filter condenses condensible gases which are then absorbed by the activated carbon. Silica gel condenses water vapor and the water absorbs water soluble gases.
- the third filter 18 is impregnated with alkali-reacting materials (such as sodium carbonate, soda lime, sodium phosphate and borax).
- alkali-reacting materials such as sodium carbonate, soda lime, sodium phosphate and borax.
- Soda lime is a mixture of sodium hydroxide and calcium oxide reacted together to form pellets that are rather hard and have definite and well formed physical structures.
- the alkaline reacting substances remove acetic acid, formic acid and -acidic phenolic compounds.
- the fourth filter 20 contains catalytic oxides for converting any carbon monoxide to carbon dioxide.
- the catalytic materials comprise manganese dioxide, chromium trioxide, -and other oxides of chromium and copper oxide.
- the fifth filter 22 contains acidic acting substances for combining with alkaline noxious substances such as vaporized nicotine and other organic amines.
- the filter 22 may contain as the acidic reacting substances sodium bisulfate, and/or sodium acid phosphate, citric acid, and sodium acid tartrate.
- the sixth filter 24 can be used with alkaline reacting substances like the filter 18 for the purpose of removing carbon dioxide which has been formed by converting the carbon monoxide in the fourth filter 20. Since carbon 3 dioxide is known to be a harmless product in small quantities, this filter 24 and its function can be omitted, if desired.
- the seventh filter 26 is a clear fine mesh filter like the firstv filter 14, and beyond this last filter 26 there is a short length of reconstituted tobacco 28 for reconstituting the taste, aroma and fragrance of the cigarette.
- This fine grade tobacco, in the gas stream, may be recessed from the back end of the cigarette, if desired. This recess is indicated by the reference character 30 in FIGURE 1.
- FIGURE 2 shows a construction in which a filter 34 replaces the plural filters of FIGURE 1.
- the various active ingredients are applied to the filter web, either as a mixture or with some of them put on the web locally to maintain some sequential resemblance as with the plural filters of FIGURE 1.
- the amount of each product of combustion that is generated by the burning of the tobacco can be computed and -the amount of active substances in the filter to prevent these products from passing through the filter zone can be determined from the known products to be absorbed. Some factor'of safety should, of course, be allowed.
- a filter cigarette structure designed to produce a flavored warm gas stream with an almost negligible amount of particulate matter at the mouth end thereof during smoking comprising a combustible charge of relatively low quality smokable material, a composite filter element constituting a fine mesh particulate matter remover selected from the groups consisting of viscose and acting agents comprising an activated carbon charge, an
- an alkali material selected from the group consisting of sodium carbonate, soda lime, sodium phosphate and borax for the removal of much of the acetic acid, formic acid and acidic phenolic compounds, a catalytic oxide selected from the group consisting of manganese dioxide, chromium ⁇ trioxide, and copper oxide for converting carbon monoxide to carbon dioxide, an acidic acting charge selected from the group consisting of sodium bisulfate, sodium acid phosphate, citric acid and sodium acid tartrate, a iinal fine mesh filter at the downstream end of the said serially arranged group and a terminal charge of higher quality tobacco designed to reintroduce avor in the filtered gas stream, the final flavor being to a large extent independent of the exact composition of the combustible charge.
- an alkali material selected from the group consisting of sodium carbonate, soda lime, sodium phosphate and borax for the removal of much of the acetic acid, formic acid and acidic phenolic compounds
- a catalytic oxide selected from the
Description
Feb. 13, 19.68
S- Z. AVEDIKIAN FILTER CIGARETTE Filed June 17, 1964 FIG. 2.
-Wxm
A TTORNE vs.-
United States Patent O M 3,368,566 FILTER CIGARETTE Souren Z. Avedkian, 34 Athens Road, Short Hills, NJ. 07078 Filed June 17, 1964, Ser. No. 375,779 1 Claim. (Cl. 131-10.7)
ABSTRACT F THE DISCLOSURE The invention relates to a cigarette having a burnable charge of relativelyv inexpensive material, a composite filter having mechanical filtering means for removing particulate material and chemical reacting materials for removing some noxious gases from the gas stream and a terminal charge of relatively high quality tobacco at the mouth end of the cigarette for providing a tobacco flavor to the exiting gas stream.
This invention relates to cigarettes and more especially to filter cigarettes.
Although filter cigarettes have come into Widespread use by those who want to` enjoy the pleasure of smoking without incurring the health hazard, it is doubtful whether any of the currently available filter cigarettes actually eliminate the health hazard. It has been established that the extensive smoking of cigarettes is apparently a cause of certain ailments, but there is doubt as to what product or products of combustion of the cigarette are primarily injurious. 'Presently used :filters remove so little of the products of combustion that they may be completely useless.
It is an object of this invention to remove practically all of the particulate matter and a very substantial amount of the other products of combustion of the cigarette. Thus much of the toxic, irritating and noxious components produced by the combustion of the cigarette are removed by the filter before they enter the mouth of the smoker. These components include nicotine, acrolein, phenolic compounds, tars, organic acids, such as acetic acid, alcohols, ketones, esters and other hydrocarbons. It is believed that the removal of these components results in a safer cigarette. The pressure drop through the cigarette need not be significantly higher than that obtained with con ventional filter cigarettes.
Another object is to provide a cigarette of the character indicated, with tobacco behind the filter for reconstituting the flavor, but this requires only a small amount of tobacco which does not burn and which is used to provide the aroma and taste that adds to the enjoyment of smoking for those who like to smoke.
Among the economic advantages of this invention are that the tobacco which is to be burned may be a grade which is low in cost since the taste" of the burning tobacco is filtered out. Only a small amount of reconstituting tobacco behind the filter need be tobacco of high quality to provide a desirable taste and aroma carried by the n1trogen stream which the smoker draws into his mouth.
The invention can be made with several short filters in series or with a single longer filter constituting the difterent ingredients required for accomplishing the new results of this invention.
Other objects, features and advantages of the invention will appear or be pointed out as the description proceeds.
In the drawing, forming a part hereof, in which like reference characters indicate corresponding parts in all the views:
FIGURE 1 is a diagramm-atic sectional view of a cigarette made in accordance with this invention and having a series of short filters; and
FIGURE 2 is a view similar to FIGURE l but showing 3,368,566 Patented Feb. 13, 1968 a modified form of the invention in which a single filter replaces the plurality of filters shown in FIGURE 1.
'I'he cigarette shown in FIGURE 1 includes a cover 10, which is conventionally made of paper and a quantity of tobacco 12 packed in the front end of the cover in accordance with conventional practice. The tobacco 12 may be a blend, and may be made up partly or wholly of some of the tobacco substitutes which have been suggested and which for purposes of this invention are to be considered equivalent of tobacco.
Beyond t-he tobacco mass 12 there are a plurality of short filters 14, 16, 18, 20, 22, 24 and 26. The cigarette will be described as having these filters, each of which performs a separate function, since this will describe the principle of the invention more clearly; but in actual practice some or -all of these plural filters are ordinarily com bined so that the number of filters is actually reduced. The first filter 14 is for the purpose of removing the solids that are present in the tobacco smoke, such as colloidal nicotine which is present as an aerosol suspension; carbon; and higher hydrocarbons (tars). This first filter 14 is a fine mesh web capable of mechanically removing small solid particles from the smoke.
The filter 14 maybe made of a carded web, oriented, -200 grains per square yard, viscose fiber, 1.5 denier, 3A to 2 long. Or it may be a carded web, oriented, 150- 450 grains per square yard, viscose fiber, 1.5 denier to 3.0 denier, 1/2 to 2" long. Such a filter made with fibers of nylon, polyesters such yas Daeron, polyethylene, polypropylene, vinyon, acrylic such as Acrilan, Orlon or Creslan, or blends of any of these, is highly satisfactory. These fibers may also be used to make the web referred to below as a Rando-Webber web.
Web made on a Rando-Webber where the web is randomly formed with the fibers blown in an airstream and deposited in a random fashion on a rotating screen, is doffed off the screen onto a conveyor. The Rando-Webber web may have a composition as follows:
Vinyon, 1/s" fiber length, 1.5 denier l040% Viscose, 1A" `fiber length, 1.5 and 3.0 denier 60-40% Glass .5 to .75 micron diameter s to fiber length,
Btl-20%.
The second -filter 16 removes condensible substances. This filter 16 contains activated carbon to which may be added, if desired, a quantity of silica gel. This filter condenses condensible gases which are then absorbed by the activated carbon. Silica gel condenses water vapor and the water absorbs water soluble gases.
The third filter 18 is impregnated with alkali-reacting materials (such as sodium carbonate, soda lime, sodium phosphate and borax). Soda lime is a mixture of sodium hydroxide and calcium oxide reacted together to form pellets that are rather hard and have definite and well formed physical structures. The alkaline reacting substances remove acetic acid, formic acid and -acidic phenolic compounds.
The fourth filter 20 contains catalytic oxides for converting any carbon monoxide to carbon dioxide. The catalytic materials comprise manganese dioxide, chromium trioxide, -and other oxides of chromium and copper oxide.
The fifth filter 22 contains acidic acting substances for combining with alkaline noxious substances such as vaporized nicotine and other organic amines. The filter 22 may contain as the acidic reacting substances sodium bisulfate, and/or sodium acid phosphate, citric acid, and sodium acid tartrate.
The sixth filter 24 can be used with alkaline reacting substances like the filter 18 for the purpose of removing carbon dioxide which has been formed by converting the carbon monoxide in the fourth filter 20. Since carbon 3 dioxide is known to be a harmless product in small quantities, this filter 24 and its function can be omitted, if desired.
The seventh filter 26 is a clear fine mesh filter like the firstv filter 14, and beyond this last filter 26 there is a short length of reconstituted tobacco 28 for reconstituting the taste, aroma and fragrance of the cigarette. This fine grade tobacco, in the gas stream, may be recessed from the back end of the cigarette, if desired. This recess is indicated by the reference character 30 in FIGURE 1.
FIGURE 2 shows a construction in which a filter 34 replaces the plural filters of FIGURE 1. The various active ingredients are applied to the filter web, either as a mixture or with some of them put on the web locally to maintain some sequential resemblance as with the plural filters of FIGURE 1.
The amount of each product of combustion that is generated by the burning of the tobacco can be computed and -the amount of active substances in the filter to prevent these products from passing through the filter zone can be determined from the known products to be absorbed. Some factor'of safety should, of course, be allowed.
' The preferred embodiment of the invention has been illustrated and described, but changes and modifications can be made, and some features can be used in different combinations without departing from the invention as defined in the claim.
i What is claimed is:
1. A filter cigarette structure designed to produce a flavored warm gas stream with an almost negligible amount of particulate matter at the mouth end thereof during smoking comprising a combustible charge of relatively low quality smokable material, a composite filter element constituting a fine mesh particulate matter remover selected from the groups consisting of viscose and acting agents comprising an activated carbon charge, an
impregnation of an alkali material selected from the group consisting of sodium carbonate, soda lime, sodium phosphate and borax for the removal of much of the acetic acid, formic acid and acidic phenolic compounds, a catalytic oxide selected from the group consisting of manganese dioxide, chromium `trioxide, and copper oxide for converting carbon monoxide to carbon dioxide, an acidic acting charge selected from the group consisting of sodium bisulfate, sodium acid phosphate, citric acid and sodium acid tartrate, a iinal fine mesh filter at the downstream end of the said serially arranged group and a terminal charge of higher quality tobacco designed to reintroduce avor in the filtered gas stream, the final flavor being to a large extent independent of the exact composition of the combustible charge.
References Cited UNITED STATES PATENTS 2,181,614 11/1939 Streifling 131-10 2,881,770 4/1959 Touey 131-208 l FOREIGN PATENTS 406,401 3/ 1934 Great Britain. 1,101,759 4/1955 France.
753,203 7/1956 Great Britain. 757,841 9/ 1956 Great Britain. 760,772 11/1956 Great Britain. 316,144 11/1956 Switzerland. 1,152,836 9/1957 France. 1,244,397 9/1960 France.
r SAMUEL KOREN, Primary Examiner.
MELVIN D. REIN, Examiner.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US375779A US3368566A (en) | 1964-06-17 | 1964-06-17 | Filter cigarette |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US375779A US3368566A (en) | 1964-06-17 | 1964-06-17 | Filter cigarette |
Publications (1)
Publication Number | Publication Date |
---|---|
US3368566A true US3368566A (en) | 1968-02-13 |
Family
ID=23482299
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US375779A Expired - Lifetime US3368566A (en) | 1964-06-17 | 1964-06-17 | Filter cigarette |
Country Status (1)
Country | Link |
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US (1) | US3368566A (en) |
Cited By (61)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3397705A (en) * | 1965-08-02 | 1968-08-20 | Eastman Kodak Co | Filter elements and additive containing material therefor |
US3417758A (en) * | 1965-01-15 | 1968-12-24 | Eastman Kodak Co | Filter elements and additives therefor |
US3426763A (en) * | 1965-07-21 | 1969-02-11 | Eastman Kodak Co | Tobacco smoke filter having a coated carbon additive |
US3428055A (en) * | 1965-04-09 | 1969-02-18 | Eastman Kodak Co | Filter elements and additive therefor |
US3447539A (en) * | 1966-11-21 | 1969-06-03 | Sutton Res Corp | Oxidized cellulose smokable product including ashing ingredient |
US3515151A (en) * | 1968-05-14 | 1970-06-02 | George Brent | Cigarette with filter |
US3658069A (en) * | 1970-02-17 | 1972-04-25 | Stanford Research Inst | Filter for reducing the level of carbon monoxide in tobacco smoke |
US3693632A (en) * | 1970-04-20 | 1972-09-26 | Brown & Williamson Tobacco | Tobacco-smoke filters |
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US3759220A (en) * | 1970-11-04 | 1973-09-18 | Canon Kk | Cleaning device in electrophotography |
US3858587A (en) * | 1974-02-05 | 1975-01-07 | Anthony R Cavelli | Magna-tip |
US3913590A (en) * | 1974-03-11 | 1975-10-21 | Boris Sway | Cigarette having distinct tobacco fillers with inert, porous, noncombustible element interposed therebetween |
US4146040A (en) * | 1977-03-17 | 1979-03-27 | Cohn Charles C | Cigarettes |
US4223597A (en) * | 1976-11-26 | 1980-09-23 | Baumgartner Papiers S.A. | Method of the production of cigarette filters |
US4291711A (en) * | 1979-03-27 | 1981-09-29 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
US4317460A (en) * | 1978-01-20 | 1982-03-02 | Gallaher Limited | Smoking products |
US4319590A (en) * | 1980-11-20 | 1982-03-16 | Patarra Sam F | Cigarette with removable smoke-modifying cartridges |
US4343320A (en) * | 1981-02-25 | 1982-08-10 | Rudolph Muto | Cigarette filter with oblique partitions |
US4355995A (en) * | 1979-03-27 | 1982-10-26 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
US4403446A (en) * | 1981-07-13 | 1983-09-13 | The Stearns & Foster Company | Hydroponic growing medium and method |
US4730628A (en) * | 1986-07-21 | 1988-03-15 | R. J. Reynolds Tobacco Company | Cigarette rods having segmented sections |
US4763674A (en) * | 1986-04-16 | 1988-08-16 | Hercules Incorporated | Method and device for controlling hydrogen cyanide and nitric oxide concentrations in cigarette smoke |
US4776354A (en) * | 1987-01-02 | 1988-10-11 | R. J. Reynolds Tobacco Company | Filtered smoking article |
US4791943A (en) * | 1985-08-26 | 1988-12-20 | Baumgartner Papiers S.A. | Cigarette filter unit and method for the production thereof |
US4889143A (en) * | 1986-05-14 | 1989-12-26 | R. J. Reynolds Tobacco Company | Cigarette rods and filters containing strands provided from sheet-like materials |
US4924883A (en) * | 1987-03-06 | 1990-05-15 | R. J. Reynolds Tobacco Company | Smoking article |
US4924888A (en) * | 1987-05-15 | 1990-05-15 | R. J. Reynolds Tobacco Company | Smoking article |
US4924887A (en) * | 1986-02-03 | 1990-05-15 | R. J. Reynolds Tobacco Company | Tobacco rods and filters |
DE3938010A1 (en) * | 1988-12-09 | 1990-06-13 | Brown & Williamson Tobacco | SMOKING ITEMS |
US4966171A (en) * | 1988-07-22 | 1990-10-30 | Philip Morris Incorporated | Smoking article |
US4991606A (en) * | 1988-07-22 | 1991-02-12 | Philip Morris Incorporated | Smoking article |
US5025814A (en) * | 1987-05-12 | 1991-06-25 | R. J. Reynolds Tobacco Company | Cigarette filters containing strands of tobacco-containing materials |
US5040551A (en) * | 1988-11-01 | 1991-08-20 | Catalytica, Inc. | Optimizing the oxidation of carbon monoxide |
US5050621A (en) * | 1988-08-12 | 1991-09-24 | British-American Tobacco Company Limited | Smoking articles |
US5076295A (en) * | 1989-09-29 | 1991-12-31 | R. J. Reynolds Tobacco Company | Cigarette filter |
US5076294A (en) * | 1990-03-29 | 1991-12-31 | R. J. Reynolds Tobacco Company | Filter cigarette |
US5105834A (en) * | 1989-12-18 | 1992-04-21 | R.J. Reynolds Tobacco Company | Cigarette and cigarette filter element therefor |
US5115823A (en) * | 1990-12-20 | 1992-05-26 | Philip Morris Incorporated | Flavor-enhancing smoking filter |
US5141006A (en) * | 1990-02-28 | 1992-08-25 | Eastman Kodak Company | Tobacco smoke filter material and process for production thereof |
US5161549A (en) * | 1990-03-20 | 1992-11-10 | Regional Research & Development Corporation | Pure clean cigarette filter |
US5211684A (en) * | 1989-01-10 | 1993-05-18 | R. J. Reynolds Tobacco Company | Catalyst containing smoking articles for reducing carbon monoxide |
US5246017A (en) * | 1990-11-06 | 1993-09-21 | R. J. Reynolds Tobacco Company | Cigarette and cigarette filter element therefor |
US5345951A (en) * | 1988-07-22 | 1994-09-13 | Philip Morris Incorporated | Smoking article |
US5396909A (en) * | 1993-12-16 | 1995-03-14 | R. J. Reynolds Tobacco Company | Smoking article filter |
US5443560A (en) * | 1989-11-29 | 1995-08-22 | Philip Morris Incorporated | Chemical heat source comprising metal nitride, metal oxide and carbon |
US5465739A (en) * | 1992-04-15 | 1995-11-14 | R. J. Reynolds Tobacco Company | Cigarette and cigarette filter element therefor |
US5495860A (en) * | 1993-07-09 | 1996-03-05 | Rhone-Poulenc Rhodia Ag | Structures formed from cellulose acetate, use thereof for the manufacture of filter tow, use of the filter tow for the manufacture of a tobacco smoke filter element, as well as a filter tow and a tobacco filter element |
US5495859A (en) * | 1993-04-14 | 1996-03-05 | 1149235 Ontario Inc. | Cigarette smoke filter system |
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US20030154993A1 (en) * | 2002-01-09 | 2003-08-21 | Paine John B. | Cigarette filter with beaded carbon |
EP1442667A1 (en) * | 2001-10-30 | 2004-08-04 | Japan Tobacco Inc. | Filter for cigarette and cigarette with filter |
US20040187881A1 (en) * | 2001-02-22 | 2004-09-30 | Richard Jupe | Cigarette and filter with downstream flavor addition |
US20040231684A1 (en) * | 2003-05-20 | 2004-11-25 | Zawadzki Michael A. | Smoking article and smoking article filter |
US20060011205A1 (en) * | 2004-07-13 | 2006-01-19 | Adiga Kayyani C | Smoking article including a catalytic smoke reformer |
US20060180164A1 (en) * | 2003-01-09 | 2006-08-17 | Philip Morris Usa Inc. | Cigarette filter with beaded carbon |
US20080025907A1 (en) * | 2000-08-09 | 2008-01-31 | Tennison Stephen R | Porous carbons |
US20080314399A1 (en) * | 2007-06-12 | 2008-12-25 | Philip Morris Usa Inc. | Smoking article |
US20110097583A1 (en) * | 2000-08-09 | 2011-04-28 | Stephen Robert Tenninson | Porous carbons |
US9491971B2 (en) | 2005-12-13 | 2016-11-15 | Philip Morris Usa Inc. | Specifically-defined smoking article with activated carbon sorbent and sodium bicarbonate-treated fibers and method of treating mainstream smoke |
US9907336B2 (en) | 2005-03-29 | 2018-03-06 | British American Tobacco (Investments) Limited | Porous carbon materials and smoking articles and smoke filters therefor incorporating such materials |
US20200205466A1 (en) * | 2012-05-25 | 2020-07-02 | Lee Philip O'donovan | Tobacco smoke filter and method of production |
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Cited By (83)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3417758A (en) * | 1965-01-15 | 1968-12-24 | Eastman Kodak Co | Filter elements and additives therefor |
US3428055A (en) * | 1965-04-09 | 1969-02-18 | Eastman Kodak Co | Filter elements and additive therefor |
US3426763A (en) * | 1965-07-21 | 1969-02-11 | Eastman Kodak Co | Tobacco smoke filter having a coated carbon additive |
US3397705A (en) * | 1965-08-02 | 1968-08-20 | Eastman Kodak Co | Filter elements and additive containing material therefor |
US3447539A (en) * | 1966-11-21 | 1969-06-03 | Sutton Res Corp | Oxidized cellulose smokable product including ashing ingredient |
US3515151A (en) * | 1968-05-14 | 1970-06-02 | George Brent | Cigarette with filter |
US3658069A (en) * | 1970-02-17 | 1972-04-25 | Stanford Research Inst | Filter for reducing the level of carbon monoxide in tobacco smoke |
US3738374A (en) * | 1970-03-05 | 1973-06-12 | B Lab | Cigar or cigarette having substitute filler |
US3693632A (en) * | 1970-04-20 | 1972-09-26 | Brown & Williamson Tobacco | Tobacco-smoke filters |
US3759220A (en) * | 1970-11-04 | 1973-09-18 | Canon Kk | Cleaning device in electrophotography |
US3858587A (en) * | 1974-02-05 | 1975-01-07 | Anthony R Cavelli | Magna-tip |
US3913590A (en) * | 1974-03-11 | 1975-10-21 | Boris Sway | Cigarette having distinct tobacco fillers with inert, porous, noncombustible element interposed therebetween |
US4223597A (en) * | 1976-11-26 | 1980-09-23 | Baumgartner Papiers S.A. | Method of the production of cigarette filters |
US4146040A (en) * | 1977-03-17 | 1979-03-27 | Cohn Charles C | Cigarettes |
US4317460A (en) * | 1978-01-20 | 1982-03-02 | Gallaher Limited | Smoking products |
US4291711A (en) * | 1979-03-27 | 1981-09-29 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
US4355995A (en) * | 1979-03-27 | 1982-10-26 | American Filtrona Corporation | Tobacco smoke filter providing tobacco flavor enrichment, and method for producing same |
US4319590A (en) * | 1980-11-20 | 1982-03-16 | Patarra Sam F | Cigarette with removable smoke-modifying cartridges |
US4343320A (en) * | 1981-02-25 | 1982-08-10 | Rudolph Muto | Cigarette filter with oblique partitions |
US4403446A (en) * | 1981-07-13 | 1983-09-13 | The Stearns & Foster Company | Hydroponic growing medium and method |
US4791943A (en) * | 1985-08-26 | 1988-12-20 | Baumgartner Papiers S.A. | Cigarette filter unit and method for the production thereof |
US4924887A (en) * | 1986-02-03 | 1990-05-15 | R. J. Reynolds Tobacco Company | Tobacco rods and filters |
US4763674A (en) * | 1986-04-16 | 1988-08-16 | Hercules Incorporated | Method and device for controlling hydrogen cyanide and nitric oxide concentrations in cigarette smoke |
US4889143A (en) * | 1986-05-14 | 1989-12-26 | R. J. Reynolds Tobacco Company | Cigarette rods and filters containing strands provided from sheet-like materials |
US4730628A (en) * | 1986-07-21 | 1988-03-15 | R. J. Reynolds Tobacco Company | Cigarette rods having segmented sections |
US4776354A (en) * | 1987-01-02 | 1988-10-11 | R. J. Reynolds Tobacco Company | Filtered smoking article |
US4924883A (en) * | 1987-03-06 | 1990-05-15 | R. J. Reynolds Tobacco Company | Smoking article |
US5025814A (en) * | 1987-05-12 | 1991-06-25 | R. J. Reynolds Tobacco Company | Cigarette filters containing strands of tobacco-containing materials |
US4924888A (en) * | 1987-05-15 | 1990-05-15 | R. J. Reynolds Tobacco Company | Smoking article |
US5345951A (en) * | 1988-07-22 | 1994-09-13 | Philip Morris Incorporated | Smoking article |
US4966171A (en) * | 1988-07-22 | 1990-10-30 | Philip Morris Incorporated | Smoking article |
US4991606A (en) * | 1988-07-22 | 1991-02-12 | Philip Morris Incorporated | Smoking article |
US5050621A (en) * | 1988-08-12 | 1991-09-24 | British-American Tobacco Company Limited | Smoking articles |
EP0712584A3 (en) * | 1988-08-12 | 1999-02-03 | British-American Tobacco Company Limited | Improvements relating to smoking articles |
EP0712584A2 (en) * | 1988-08-12 | 1996-05-22 | British-American Tobacco Company Limited | Improvements relating to smoking articles |
US5040551A (en) * | 1988-11-01 | 1991-08-20 | Catalytica, Inc. | Optimizing the oxidation of carbon monoxide |
DE3938010A1 (en) * | 1988-12-09 | 1990-06-13 | Brown & Williamson Tobacco | SMOKING ITEMS |
US5211684A (en) * | 1989-01-10 | 1993-05-18 | R. J. Reynolds Tobacco Company | Catalyst containing smoking articles for reducing carbon monoxide |
US5076295A (en) * | 1989-09-29 | 1991-12-31 | R. J. Reynolds Tobacco Company | Cigarette filter |
US5443560A (en) * | 1989-11-29 | 1995-08-22 | Philip Morris Incorporated | Chemical heat source comprising metal nitride, metal oxide and carbon |
US5105834A (en) * | 1989-12-18 | 1992-04-21 | R.J. Reynolds Tobacco Company | Cigarette and cigarette filter element therefor |
US5141006A (en) * | 1990-02-28 | 1992-08-25 | Eastman Kodak Company | Tobacco smoke filter material and process for production thereof |
US5161549A (en) * | 1990-03-20 | 1992-11-10 | Regional Research & Development Corporation | Pure clean cigarette filter |
US5076294A (en) * | 1990-03-29 | 1991-12-31 | R. J. Reynolds Tobacco Company | Filter cigarette |
US5246017A (en) * | 1990-11-06 | 1993-09-21 | R. J. Reynolds Tobacco Company | Cigarette and cigarette filter element therefor |
US5115823A (en) * | 1990-12-20 | 1992-05-26 | Philip Morris Incorporated | Flavor-enhancing smoking filter |
US6311696B1 (en) * | 1991-05-20 | 2001-11-06 | British-American Tobacco Company Limited | Smoking articles |
US5465739A (en) * | 1992-04-15 | 1995-11-14 | R. J. Reynolds Tobacco Company | Cigarette and cigarette filter element therefor |
US5495859A (en) * | 1993-04-14 | 1996-03-05 | 1149235 Ontario Inc. | Cigarette smoke filter system |
US5497791A (en) * | 1993-04-14 | 1996-03-12 | 114935 Ontario Inc. | Smoker's accessory |
US5638833A (en) * | 1993-04-14 | 1997-06-17 | 1149235 Ontario Inc. | Cigarette smoke filter system |
US5752527A (en) * | 1993-04-14 | 1998-05-19 | Ontario Inc. | Smoker's accessory |
US5495860A (en) * | 1993-07-09 | 1996-03-05 | Rhone-Poulenc Rhodia Ag | Structures formed from cellulose acetate, use thereof for the manufacture of filter tow, use of the filter tow for the manufacture of a tobacco smoke filter element, as well as a filter tow and a tobacco filter element |
US5396909A (en) * | 1993-12-16 | 1995-03-14 | R. J. Reynolds Tobacco Company | Smoking article filter |
US20080032092A1 (en) * | 2000-08-07 | 2008-02-07 | Tennison Stephen R | Porous carbons |
US20080025907A1 (en) * | 2000-08-09 | 2008-01-31 | Tennison Stephen R | Porous carbons |
US20110097583A1 (en) * | 2000-08-09 | 2011-04-28 | Stephen Robert Tenninson | Porous carbons |
US8591855B2 (en) | 2000-08-09 | 2013-11-26 | British American Tobacco (Investments) Limited | Porous carbons |
US8227518B2 (en) | 2000-08-09 | 2012-07-24 | British American Tobacco (Investments) Ltd. | Porous carbons |
US20110237691A1 (en) * | 2000-08-09 | 2011-09-29 | Stephen Robert Tennison | Porous carbons |
US7850942B2 (en) | 2000-08-09 | 2010-12-14 | British American Tobacco (Investments) Ltd. | Porous carbons |
US7842736B2 (en) | 2000-08-09 | 2010-11-30 | British American Tobacco (Investments) Limited | Porous carbons |
US20100035058A1 (en) * | 2000-08-09 | 2010-02-11 | Stephen Robert Tennison | Porous carbons |
US20100029795A1 (en) * | 2000-08-09 | 2010-02-04 | Stephen Robert Tennison | Porous carbons |
US7484511B2 (en) | 2001-02-22 | 2009-02-03 | Philip Morris Usa Inc. | Cigarette and filter with downstream flavor addition |
US20040187881A1 (en) * | 2001-02-22 | 2004-09-30 | Richard Jupe | Cigarette and filter with downstream flavor addition |
EP1442667A4 (en) * | 2001-10-30 | 2005-11-02 | Japan Tobacco Inc | Filter for cigarette and cigarette with filter |
US20040200490A1 (en) * | 2001-10-30 | 2004-10-14 | Michihiro Inagaki | Cigarette filter and filter-tipped cigarette |
EP1442667A1 (en) * | 2001-10-30 | 2004-08-04 | Japan Tobacco Inc. | Filter for cigarette and cigarette with filter |
US7997282B2 (en) | 2002-01-09 | 2011-08-16 | Philip Morris Usa Inc. | Cigarette filter with beaded carbon |
US20030154993A1 (en) * | 2002-01-09 | 2003-08-21 | Paine John B. | Cigarette filter with beaded carbon |
US7784470B2 (en) | 2002-01-09 | 2010-08-31 | Philip Morris Usa Inc. | Cigarette filter with beaded carbon |
US20080053469A1 (en) * | 2002-01-09 | 2008-03-06 | Philip Morris Usa Inc. | Cigarette filter with beaded carbon |
US7784471B2 (en) | 2003-01-09 | 2010-08-31 | Philip Morris Usa Inc. | Cigarette filter with beaded carbon |
US20060180164A1 (en) * | 2003-01-09 | 2006-08-17 | Philip Morris Usa Inc. | Cigarette filter with beaded carbon |
US20040231684A1 (en) * | 2003-05-20 | 2004-11-25 | Zawadzki Michael A. | Smoking article and smoking article filter |
US20060011205A1 (en) * | 2004-07-13 | 2006-01-19 | Adiga Kayyani C | Smoking article including a catalytic smoke reformer |
US7231923B2 (en) * | 2004-07-13 | 2007-06-19 | R.J. Reynolds Tobacco Company | Smoking article including a catalytic smoke reformer |
US9907336B2 (en) | 2005-03-29 | 2018-03-06 | British American Tobacco (Investments) Limited | Porous carbon materials and smoking articles and smoke filters therefor incorporating such materials |
US9491971B2 (en) | 2005-12-13 | 2016-11-15 | Philip Morris Usa Inc. | Specifically-defined smoking article with activated carbon sorbent and sodium bicarbonate-treated fibers and method of treating mainstream smoke |
US20080314399A1 (en) * | 2007-06-12 | 2008-12-25 | Philip Morris Usa Inc. | Smoking article |
US8499767B2 (en) * | 2007-06-12 | 2013-08-06 | Philip Morris Usa Inc. | Smoking article |
US20200205466A1 (en) * | 2012-05-25 | 2020-07-02 | Lee Philip O'donovan | Tobacco smoke filter and method of production |
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