US3731037A - Microwave kiln to cook food - Google Patents
Microwave kiln to cook food Download PDFInfo
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- US3731037A US3731037A US00193940A US3731037DA US3731037A US 3731037 A US3731037 A US 3731037A US 00193940 A US00193940 A US 00193940A US 3731037D A US3731037D A US 3731037DA US 3731037 A US3731037 A US 3731037A
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- microwave
- lossy
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- heat
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- 235000013305 food Nutrition 0.000 title description 13
- 239000000463 material Substances 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000000696 magnetic material Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 22
- 229910052782 aluminium Inorganic materials 0.000 claims description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 21
- 239000011810 insulating material Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000010411 cooking Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 239000002241 glass-ceramic Substances 0.000 description 7
- 235000021158 dinner Nutrition 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 235000021168 barbecue Nutrition 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 235000013882 gravy Nutrition 0.000 description 3
- 235000015220 hamburgers Nutrition 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 235000013372 meat Nutrition 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 235000012054 meals Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/647—Aspects related to microwave heating combined with other heating techniques
- H05B6/6491—Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors
- H05B6/6494—Aspects related to microwave heating combined with other heating techniques combined with the use of susceptors for cooking
Definitions
- This invention provides a microwave oven, per se, with means to fry, bake, broil, brown and barbecue.
- Various systems are in use to accomplish this purpose, for example, a conventional gas or electric oven to which a microwave heating feature has been appended, but none, completely microwave powered, that are satisfactory.
- One object of this invention is to provide structure for a microwave oven which will fry, bake, broil, brown and/or barbecue food.
- Another object of this invention is to provide a new oven, a combination of an infra red oven and a microwave oven.
- Another object of this invention is to provide structure for a microwave oven which will safely accept, defrost and cook TV dinners prepackaged in aluminum trays.
- Another object of this invention is to describe means and methods of cooking meat in metal containers in a microwave oven to provide rare and medium rare cooked portions.
- This invention concerns animproved microwave heating member which can'be an integral or removable member of a microwave oven.
- Said member being a heat-insulating structure containing a work chamber therein.
- Said'heat-insulating structure designed to confine and allow for a build up of heat energy.
- Said work chamber contains a microwave lossy material capable of, on exposure to microwave energy, producing a hot dry heat.
- a foodstuff in a container placed within said chamber heats from the direct action of microwave radiation and from heat transfer into the container from said microwave lossy material.
- FIG. 1 is a cut-away, side view of the invention for use in a work chamber of a microwave oven.
- FIG. 2 is a cross section view of invention taken along line 2-2 of FIG. 1.
- FIGS. 1 and 2 in the drawing there is depicted a cutaway, side view and a cross section view of a heat insulating box 1, containing a work chamber 2, resting on a floor or shelf 13 in an oven chamber (not shown) of a microwave oven (not shown).
- the heat insulating walls 3 of work chamber 2 are lined with a microwave lossy lining 4.
- Section 5, consisting of the entire front plus a small part of top and top sides of box 1, can be removed to expose work chamber 2 and permit the insertion and removal of a foodstuff 6.
- Foodstuff 6 is shown contained in a removable container 7 provided with a handle.
- Heat insulating walls are best made of a low-loss, low-mass, heat-insulating material capable of withstanding the high refractory temperatures, circa 2,000F, generated by microwave lossy lining 4. Heat insulating walls 3s insulating capabilities can be further enhanced by means described more fully in my U.S. Pat. No. 3,539,751. Illustrated are a planned pattern of holes 8-8 drilled in heat insulating walls 3 and sealed by seals 99 to lower mass of walls 3. Fired insulating refractory material as manufactured by General Refractories Company for their insulating fire brick, for example GR-25, is satisfactory.
- Work chamber 2 (with section 5 in place) is a closed cavity. By its nature heat energy in a closed, heat-insulated cavity must equalize and become homogeneous. Heat is transferred amongst all parts of work chamber 2, lining 4, foodstuff 6 and container 7 not only by conducted, convected and radiant heat transfer, but by heat transfer of water vapor condensing on colder sections and evaporating from hotter sections.
- floor lining 11 When floor lining 11 is constructed of a porous material, as ceramic refractory mortar, water condensing on the outer sides of container 7 drips off and is absorbed and, by capillary action, dispersed in floor lining 11 where it presents a larger volume to the microwave energy, and, because of direct microwave heating and heating by the lossy materialof floor lining 11, it speedily evaporates and condenses ultimately on the cooler sections of the workload. This results in more juices and gravies, no
- a 50-50O "F metal thermometer 12 as Weston Model 2261 or Model 2292, arranged as to be viewed through a window in a microwave oven door (not shown) so that the cooking process can be temperature monitored.
- the second TV dinner cooked accordingely in the instant preheated work chamber 2 takes only slightly less time to cook because foodstuff 6 represents the real load to the microwave oven, and its mass and the microwave power level determines the length of time for cooking.
- the utility of the kiln is to cook a foodstuff to a desirable internal and external temperature, and not, whether lossy lining 4 reaches 500 or 1,500F.
- the kilns job is to increase efficiency while affecting the flavor, color and crust while microwave energy defrosts and cooks.
- Thermometer l2 helps determine when cooking is completed when exact measurements, size and composition of foodstuff 6 is not known. If conditions are fixed as in industrial cooking or repeat cooking of the same manufacturers identical TV dinners, a simple conventional timer (not shown) can 'be employed. I prefer a combination of timer and thermometer.
- aluminum representative of other nonmagnetic metals can be additionally used as follows: I have discovered that a mixture of two microwave lossy materials 31, 32, one which is lossy because of its electrical properties 32, as carbon, mixed with a second material which is principally lossy because of its magnetic properties 31, as ferrite, with or without a refractory mortar binder, and spread out as a thin floor lining ll, draws power more evenly from both the electric and magnetic fields and results in better loading with less spot heating. Said better loading and evener heating is advantageous when kiln is preheated empty. And,
- the electrical material 38 is not lossy in juxtaposition as the electric field is at a minimum close to metal aluminum container 7.
- the magnetic field and the heating of the magnetic material 31 is at maximum close to the aluminum surface. This rule I find true if microwave energy can also approach the upper side of container 7.
- the heat conducting properties of aluminum and the relatively cool container 7 and foodstuff 6 operate together to keep the magnetic material 31 in thermal contact with aluminum container 7 below its Curie point.
- the other sections of floor lining 11, not covered by aluminum container 7, remain lossy in response to both the electric and magnetic field and readily evaporate and recycle condensed water dripping off the outside of aluminum container 7.
- proximetry with aluminum container 7 turns off some of the lossiness of floor lining 11' and so effectively makes more microwave energy available for roof lining and foodstuff 6.
- roof lining l0 hotter use shiny aluminum rather than glass ceramic.
- Food shielded from microwave energy by being placed in a closed-to-microwave-energy metal container can be baked in a heated kiln. More than one container 7 can be used simultaneously, and each can be of different material. One metal container can hold a second. Container 7 may be made of lossy material and foodstuff 6 may be non lossy. Crusted frozen baked products can be defrosted directly without container 7.
- Meat can be barbecued in work chamber 2 by heating lining 4 hot enough to ignite fat.
- Barbecuing can take place with either section 5 off, in which case flames will issue, or, can be operated with section 5 in place where lacking oxygen slow combustion takes place.
- care must be exercised opening work chamber 2, if flames shoot out, replace section 5 until work chamber 2 cools below ignition point. In either case means for venting (not shown) products of combustion must be employed.
- Work chamber 2 is self cleaning in the manor of typical self cleaning ovens that are heated empty to such temperature as will burn off accumulated mess and splatter.
- the top temperature work chamber 2 can reach is fixed by the thickness and material of heat insulating walls 3 multiplied times the highest power level of the microwave oven s generator.
- a microwave oven comprising a chamber for receiving an article to be heated, means for emitting microwave energy to said chamber, and a heating member within said chamber, the improvement in said heating member comprising:
- access means to said chamber for receiving an article to be heated.
- an aluminum container for receiving said article to be heated.
- a microwave oven comprising a chamber for receiving an article to be heated, means for emitting microwave energy to said chamber, and a heating member within said chamber, the improvement in said heating member comprising:
- a lossy material lining the base of said chamber, said base being provided with a mixture of lossy electrical material and lossy magnetic material, and
- access means to said chamber for receiving an article to be heated.
- the base is porous to liquids.
Abstract
A microwave oven is provided with a heat insulating structure containing a work chamber lined with a microwave lossy material where said lining: 1) can be porous to water, 2) can represent an acceptable load to said microwave oven, 3) can define a closed cavity, 4) can be a mixture of a lossy electrical material and a lossy magnetic material, and 5) can be used in conjunction with a non-magnetic-metal, heat-conducting workload container.
Description
United States Patent [191 Levinson [451 May 1, 1973 MICROWAVE KILN TO COOK FOOD [76] Inventor: Melvin L. Levin son, l Meinzer Street, Avenel, NJ. 07001 2,622,187 12/1952 Welch ..2l9/l0.55 2,648,047 8/1953 Hollingsworth... ..333/81 8 2,830,162 4/1958 Copson ct a1 ..2l9/10.55 X
- 3,469,053 9/1969 Levinson ..219/10.55
Levinson "219/1055 Primary Examiner.l. V. Truhe Assistant Examiner-Hugh D. .laegcr Attorney-John J. Lipari 1968. [57] ABSTRACT A microwave oven is provided with a heat insulating Ccll "5524,1852 structure Containing a work Chamber lined with a d 55 lo microwave lossy material where said lining: 1) can be 1 o earc porous to water, 2) can represent an acceptable load to said microwave oven, 3) can define a closed cavity, 1 I 4) can be a mixture of a lossy electrical material and a [56] References C'ted lossy magnetic material, and 5) can be used in con- UNITED STATES PATENTS junction with a non-magnetic-metal, heat-conducting workload container, 2,495,435 1/1950 Welch ..2l9/l0.55 X 2,600,566 6/1952 Molfett ..2l9/10.55 7 Claims, 3 Drawing Figures 7 mrmamfl\ v|0\ I Pa tented May 1, 1973 P xxx FIG.5
MICROWAVE KILN TO COOK FOOD CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation-in-part of my copending application, U.S. Ser. No. 704,389, filed Feb. 9, 1968.
BACKGROUND OF THE INVENTION This invention provides a microwave oven, per se, with means to fry, bake, broil, brown and barbecue. Various systems are in use to accomplish this purpose, for example, a conventional gas or electric oven to which a microwave heating feature has been appended, but none, completely microwave powered, that are satisfactory.
Structures which enable a microwave oven to fry, bake, broil, brown and barbecue are described in my copending application, U.S. Ser. No. 704,389. Said application concerns heat insulating structures which contain and direct heat released from microwave lossy material onto a workload and include the use of heat conducting material to better accomplish even, efficient heating. My U.S. Pat. No. 3,469,053, Microwave Kiln, describes a dry-heat, oven structure which can be an integral or removable part of a microwave oven. My U.S. Pat. No. 3,585,258, Method of Firing Ceramic Articles Utilizing Microwave Energy, describes methods of heating in a microwave oven. My U.S. Pat. No. 3,539,751, Insulating Implement for Use in a Microwave Oven, describes improved ways of containing and directing the heat evolved from microwave irradiation of lossy material. This invention describes novel combinations of my said U.S. Pat. Application Ser. No. 704,389 and U.S. Pat. Nos. 3,469,053,
' 3,585,258 and 3,539,75l and new improvements.
One object of this invention is to provide structure for a microwave oven which will fry, bake, broil, brown and/or barbecue food.
Another object of this invention is to provide a new oven, a combination of an infra red oven and a microwave oven.
Another object of this invention is to provide structure for a microwave oven which will safely accept, defrost and cook TV dinners prepackaged in aluminum trays. 1
Another object of this invention is to describe means and methods of cooking meat in metal containers in a microwave oven to provide rare and medium rare cooked portions.
SUMMARY OF THE INVENTION This invention concerns animproved microwave heating member which can'be an integral or removable member of a microwave oven. Said member being a heat-insulating structure containing a work chamber therein. Said'heat-insulating structure designed to confine and allow for a build up of heat energy. Said work chamber contains a microwave lossy material capable of, on exposure to microwave energy, producing a hot dry heat. A foodstuff in a container placed within said chamber heats from the direct action of microwave radiation and from heat transfer into the container from said microwave lossy material.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a cut-away, side view of the invention for use in a work chamber of a microwave oven.
FIG. 2 is a cross section view of invention taken along line 2-2 of FIG. 1.
FIG. 3 is a cross-section, composite view depicting additional embodiments of the invention.
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT With reference to FIGS. 1 and 2 in the drawing, there is depicted a cutaway, side view and a cross section view of a heat insulating box 1, containing a work chamber 2, resting on a floor or shelf 13 in an oven chamber (not shown) of a microwave oven (not shown). The heat insulating walls 3 of work chamber 2 are lined with a microwave lossy lining 4. Section 5, consisting of the entire front plus a small part of top and top sides of box 1, can be removed to expose work chamber 2 and permit the insertion and removal of a foodstuff 6. Foodstuff 6 is shown contained in a removable container 7 provided with a handle.
Heat insulating walls are best made of a low-loss, low-mass, heat-insulating material capable of withstanding the high refractory temperatures, circa 2,000F, generated by microwave lossy lining 4. Heat insulating walls 3s insulating capabilities can be further enhanced by means described more fully in my U.S. Pat. No. 3,539,751. Illustrated are a planned pattern of holes 8-8 drilled in heat insulating walls 3 and sealed by seals 99 to lower mass of walls 3. Fired insulating refractory material as manufactured by General Refractories Company for their insulating fire brick, for example GR-25, is satisfactory.
The microwave lossy lining 4 can be made of many suitable materials constituted to withstand the temperature shock and repeated heat recycling associated with normal oven usage. I find General Refractories Companys Briklok A made lossy by the addition of ferrite and carbon materials suitable. This material is a brick mortar which adheres to the insulating fir'ebrick material. It is advisable to fire the assembled kiln before its initial use. Other suitable materials for lining 4 include quartz or glass ceramic made lossy by the inclusion of pockets of electrically arcing particles, as described in .my copending application No. 704,389, or a lining of lossy glass ceramic or ferrite. Preferred is a lossy material that also permits the passage of microwave energy there thru while heating to a high temperature. Lining 4 need not be smooth for a rough lining presents a larger surface area. Many materials classified as low loss when heated to a high temperature become lossy along with lossy lining 4, and when all is hot and lossy, microwave power expends itself principally in the densor lining 4 and work chamber 2 contents. The outer surface of heat insulating walls 3 should be kept in their characteristic low loss state by radiating heat to the cool oven chamber walls 13 and kept cool from air normally circulated in a conventional microwave oven schamber.
In FIG. 3, it is preferred to make the roof lining l0 lossier than floor lining 11. One way to accomplish this isto build into roof lining 10 a pocket 30 of microwave lossy arcing material, as ferrite particles 31, more fully described in my copending application, U.S. Ser. No. 704,389. In operation, roof lining heats to a higher temperature than the floor lining 11 and browns the top of the foodstuff 6 principally by radiant heat transfer.
Work chamber 2 (with section 5 in place) is a closed cavity. By its nature heat energy in a closed, heat-insulated cavity must equalize and become homogeneous. Heat is transferred amongst all parts of work chamber 2, lining 4, foodstuff 6 and container 7 not only by conducted, convected and radiant heat transfer, but by heat transfer of water vapor condensing on colder sections and evaporating from hotter sections. When floor lining 11 is constructed of a porous material, as ceramic refractory mortar, water condensing on the outer sides of container 7 drips off and is absorbed and, by capillary action, dispersed in floor lining 11 where it presents a larger volume to the microwave energy, and, because of direct microwave heating and heating by the lossy materialof floor lining 11, it speedily evaporates and condenses ultimately on the cooler sections of the workload. This results in more juices and gravies, no
need for basting and easier cleaning containers. Very little water is observed lost from heat insulating box 1 6 until the foodstuff 6 approaches temperatures hotter than are required for eating. In fact, the escape of observable steam (note that section 5 does not form a vapor tight joint) generally signals either too rapid heating or that the food is properly heated and can be removed.
I prefer to equip my microwave kiln with a 50-50O "F metal thermometer 12, as Weston Model 2261 or Model 2292, arranged as to be viewed through a window in a microwave oven door (not shown) so that the cooking process can be temperature monitored.
The methods of using a microwave kiln for cooking are as varied as the type of meals one can cook. One representative method is to expose foodstuff in kiln to microwave energy for a fixed period of time and then allow a resting time before kiln is opened. Food can be cooked fora short time to start the cooking process and then removed from the oven in the still unopened kiln for transporting to a remote eating area while the food continues to cook from the heat stored in lining 4, and, when the temperature of the work chamber 2 and its contents finally equalize, insulating walls 3 continueto hold food hot, as in a Thermos bottle, for extended periods of time. New skills must be learned and practiced to capitalize fully .on the usefulness of this microwave kiln. lt must be'kept in mind that air temperature in work chamber 2 and radiant heat temperature striking the food are both independent and effective. For example, thermometer 12 may be reading 'l20F air temperature while the food is burning from radiant heat energy. I
In another representative method of-operation, a removable microwave kiln l is inserted into a microwave ovens cavity (not shown) with a frozen TV dinner, foodstuff6 in its aluminum container 7, in kiln s work chamber 2. The oven is energized. Since the food is frozen, it is less lossy than when defrosted. Hence, initially more microwave energy is available to heat up lining 4 and crust the surface of foodstuff 6. Thermometer 12 indicates the air temperature of work chamber 2 and signals when to stop cooking and remove cooked foodstuff 6 in its heated container 7. A
second TV dinner cooked imediately in the instant preheated work chamber 2 takes only slightly less time to cook because foodstuff 6 represents the real load to the microwave oven, and its mass and the microwave power level determines the length of time for cooking. The utility of the kiln is to cook a foodstuff to a desirable internal and external temperature, and not, whether lossy lining 4 reaches 500 or 1,500F. The kilns job is to increase efficiency while affecting the flavor, color and crust while microwave energy defrosts and cooks. Thermometer l2 helps determine when cooking is completed when exact measurements, size and composition of foodstuff 6 is not known. If conditions are fixed as in industrial cooking or repeat cooking of the same manufacturers identical TV dinners, a simple conventional timer (not shown) can 'be employed. I prefer a combination of timer and thermometer.
In a second representative example of operation, either with or without empty container 7 as desired, microwave kiln 1 is heated to a predetermined temperature without foodstuff 6 in work chamber 2. At the predetermined temperature, say 500F, (generally hotter than would be proper for gas or electric ovens because microwaves speed, in deep cooking and defrosting, leaves less time for surface browning) foodstuff 6 is introduced into hot work chamber 2. If empty container 7 was included in the preheating and it is of sufficient mass, foodstuff 6 is scared when it first contacts hot container 7, and thenceforth, microwave energy and heat energy stored in lining 4 finishes the cooking and browning.
The selection of material for container 11 can be used to vary the results. For instance, it is easier to cook a hamburger well done, in a glass ceramic container 7 than in an aluminum container 7. Non lossy glass ceramic tends to become lossy as it heats and it retains its heat longer to keep food hotter longer on subsequent service. An aluminum pan is generally manufactured with less mass than a comparable glass ceramic pan so has less thermal capacity. Aluminum is a good heat conductor, and heat, which its outer surfaces (acting as heat absorbent fins) collect from the hot work chamber 2, is readily transferred to cooler foodstuff 6. it is easier to cook a hamburger rare or medium in an aluminum container 7. Aluminum collects more gravy as it shields the. gravy from direct microwave action. I prefer to cook my hamburgers in.
small 4"inch aluminum foil pie dishes, but it must be understood that while aluminum-may slightly favor glass ceramics larger mass takes longer to heat and oven would have to be preheated).
In FIG. 3, aluminum representative of other nonmagnetic metals, can be additionally used as follows: I have discovered that a mixture of two microwave lossy materials 31, 32, one which is lossy because of its electrical properties 32, as carbon, mixed with a second material which is principally lossy because of its magnetic properties 31, as ferrite, with or without a refractory mortar binder, and spread out as a thin floor lining ll, draws power more evenly from both the electric and magnetic fields and results in better loading with less spot heating. Said better loading and evener heating is advantageous when kiln is preheated empty. And,
when aluminum container 7 subsequently rests on said preheated mixture, the electrical material 38 is not lossy in juxtaposition as the electric field is at a minimum close to metal aluminum container 7. The magnetic field and the heating of the magnetic material 31 is at maximum close to the aluminum surface. This rule I find true if microwave energy can also approach the upper side of container 7. The heat conducting properties of aluminum and the relatively cool container 7 and foodstuff 6 operate together to keep the magnetic material 31 in thermal contact with aluminum container 7 below its Curie point. The other sections of floor lining 11, not covered by aluminum container 7, remain lossy in response to both the electric and magnetic field and readily evaporate and recycle condensed water dripping off the outside of aluminum container 7. Note that, in this case, proximetry with aluminum container 7 turns off some of the lossiness of floor lining 11' and so effectively makes more microwave energy available for roof lining and foodstuff 6. To make the, roof lining l0 hotter use shiny aluminum rather than glass ceramic.
Food shielded from microwave energy by being placed in a closed-to-microwave-energy metal container can be baked in a heated kiln. More than one container 7 can be used simultaneously, and each can be of different material. One metal container can hold a second. Container 7 may be made of lossy material and foodstuff 6 may be non lossy. Crusted frozen baked products can be defrosted directly without container 7.
Meat can be barbecued in work chamber 2 by heating lining 4 hot enough to ignite fat. Barbecuing can take place with either section 5 off, in which case flames will issue, or, can be operated with section 5 in place where lacking oxygen slow combustion takes place. When barbecuing with section 5 in place, care must be exercised opening work chamber 2, if flames shoot out, replace section 5 until work chamber 2 cools below ignition point. In either case means for venting (not shown) products of combustion must be employed.
The top temperature work chamber 2 can reach is fixed by the thickness and material of heat insulating walls 3 multiplied times the highest power level of the microwave oven s generator.
Although this invention has been described with a certain degree of particularity, it is understood that the present disclosure has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention, as a disposable, one time kiln to heat a foodstuff 6 in an aluminum container 7 where walls 3 are polyurethane foam and lossy floor lining 1 1 is water 33 as illustrated in FIG. 3.
I claim:
1. In a microwave oven comprising a chamber for receiving an article to be heated, means for emitting microwave energy to said chamber, and a heating member within said chamber, the improvement in said heating member comprising:
a body of non-lossy, microwave-permeable, heat-msulating material forming a chamber therein,
a lossy material lining the interior walls of said chamber, and
access means to said chamber for receiving an article to be heated.
2. In a microwave oven according to claim 1, where said heating member provides an acceptable load to said means for emitting microwave energy.
3. In a microwavev oven according to claim 1, wherein at least one wall of said lining is provided with pockets of microwave-lossy, arcing material.
4. In a microwave oven according to claim 1, wherein the roof of the lining is more lossy than the base.
5. In a microwave oven according to claim 1, an aluminum container for receiving said article to be heated.
6. In a microwave oven comprising a chamber for receiving an article to be heated, means for emitting microwave energy to said chamber, and a heating member within said chamber, the improvement in said heating member comprising:
a body of non-lossy, microwave-permeable, heat-insulating material forming a chamber therein,
a lossy material lining the base of said chamber, said base being provided with a mixture of lossy electrical material and lossy magnetic material, and
access means to said chamber for receiving an article to be heated.
7. In a microwave oven according to claim 6,
wherein the base is porous to liquids.
Claims (7)
1. In a microwave oven comprising a chamber for receiving an article to be heated, means for emitting microwave energy to said chamber, and a heating member within said chamber, the improvement in said heating member comprising: a body of non-lossy, microwave-permeable, heat-insulating material forming a chamber therein, a lossy material lining the interior walls of said chamber, and access means to said chamber for receiving an article to be heated.
2. In a microwave oven according to claim 1, where said heating member provides an acceptable load to said means for emitting microwave energy.
3. In a microwave oven according to claim 1, wherein at least one wall of said lining is provided with pockets of microwave-lossy, arcing material.
4. In a microwave oven according to claim 1, wherein the roof of the lining is more lossy than the base.
5. In a microwave oven according to claim 1, an aluminum container for receiving said article to be heated.
6. In a microwave oven comprising a chamber for receiving an article to be heated, means for emitting microwave energy to said chamber, and a heating member within said chamber, the improvement in said heating member comprising: a body of non-lossy, microwave-permeable, heat-insulating material forming a chamber therein, a lossy material lining the base of said chamber, said base being provided with a mixture of lossy electrical material and lossy magnetic material, and access means to said chamber for receiving an article to be heated.
7. In a microwave oven according to claim 6, wherein the base is porous to liquids.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US19394071A | 1971-10-29 | 1971-10-29 |
Publications (1)
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US3731037A true US3731037A (en) | 1973-05-01 |
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Application Number | Title | Priority Date | Filing Date |
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US00193940A Expired - Lifetime US3731037A (en) | 1971-10-29 | 1971-10-29 | Microwave kiln to cook food |
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US (1) | US3731037A (en) |
Cited By (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3849622A (en) * | 1969-06-16 | 1974-11-19 | C Merriam | Non-ionic fluid thermometer for microwave oven |
US3941967A (en) * | 1973-09-28 | 1976-03-02 | Asahi Kasei Kogyo Kabushiki Kaisha | Microwave cooking apparatus |
US4027132A (en) * | 1975-04-17 | 1977-05-31 | Levinson Melvin L | Microwave pie baking |
US4117058A (en) * | 1976-12-03 | 1978-09-26 | General Motors Corporation | Method of making boron containing strontium ferrite |
US4190757A (en) * | 1976-10-08 | 1980-02-26 | The Pillsbury Company | Microwave heating package and method |
US4239009A (en) * | 1979-08-29 | 1980-12-16 | Plastics, Inc. | Portable turntable for microwave oven |
US4306133A (en) * | 1979-02-14 | 1981-12-15 | Levinson Melvin L | Microwave pie baking |
US4330696A (en) * | 1978-04-17 | 1982-05-18 | Plastics, Inc. | Portable turntable for ovens |
US4362917A (en) * | 1980-12-29 | 1982-12-07 | Raytheon Company | Ferrite heating apparatus |
US4398077A (en) * | 1980-10-06 | 1983-08-09 | Raytheon Company | Microwave cooking utensil |
US4405850A (en) * | 1978-10-06 | 1983-09-20 | Raytheon Company | Combination microwave heating apparatus |
US4439656A (en) * | 1981-04-06 | 1984-03-27 | The Stouffer Corporation | Apparatus and method for the reconstitution of frozen foods in a microwave oven |
US4754111A (en) * | 1980-03-18 | 1988-06-28 | Plastics, Inc. | Portable turntable for ovens |
US4803324A (en) * | 1985-02-15 | 1989-02-07 | Sharp Kabushiki Kaisha | Microwave heating and infrared ray heating appliance |
US4822966A (en) * | 1987-02-20 | 1989-04-18 | Yuzuru Matsubara | Method of producing heat with microwaves |
EP0333863A1 (en) * | 1987-08-22 | 1989-09-27 | YANO, Shusuke | Far infrared ray generator |
US4886948A (en) * | 1978-04-17 | 1989-12-12 | Plastics, Inc. | Portable turntable with shielded drive motor for microwave ovens |
US4904836A (en) * | 1988-05-23 | 1990-02-27 | The Pillsbury Co. | Microwave heater and method of manufacture |
FR2641855A1 (en) * | 1989-01-18 | 1990-07-20 | Cem Corp | MICROWAVE INCINERATION AND ANALYSIS APPARATUS COMPONENTS AND METHODS |
FR2648219A1 (en) * | 1989-01-18 | 1990-12-14 | Cem Corp | Receptacle and method of manufacturing such a receptacle, for incineration in a microwave oven |
US5066843A (en) * | 1989-01-18 | 1991-11-19 | Cem Corporation | Heat resistant and light weight container for materials to be ashed, and process for manufacture thereof |
US5136133A (en) * | 1988-09-28 | 1992-08-04 | Briggs David H | Microwave heating apparatus |
US5272302A (en) * | 1991-12-17 | 1993-12-21 | Raytheon Company | Microwave oven with improved cooking uniformity |
US5519196A (en) * | 1995-06-01 | 1996-05-21 | Xu; Liming | Material for converting microwave energy into thermal energy, and a cooking receptacle fabricated from that material |
AT409322B (en) * | 1989-01-18 | 2002-07-25 | Cem Corp | Heat-resistant container (vessel) for ashable material, and a method for producing the container |
US20050211705A1 (en) * | 2004-02-05 | 2005-09-29 | Eiji Nomura | Microwave burning furnace |
US20060289514A1 (en) * | 2005-04-19 | 2006-12-28 | Electrolux Professional Spa | Apparatus for cooking food products on both sides thereof |
US20070092609A1 (en) * | 2005-10-26 | 2007-04-26 | H. J. Heinz Company | Food container |
CN102331008A (en) * | 2011-08-12 | 2012-01-25 | 电子科技大学 | Microwave and steam cooking two-purpose microwave oven |
EP3343111A4 (en) * | 2015-11-16 | 2018-11-14 | Samsung Electronics Co., Ltd. | Cooking apparatus, control method therefor and double plate |
US10791871B2 (en) | 2014-03-17 | 2020-10-06 | Jong Peter Park | Travel mug for microwave oven |
Citations (7)
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US2495435A (en) * | 1947-01-14 | 1950-01-24 | Raytheon Mfg Co | Method of treating foodstuffs |
US2600566A (en) * | 1949-11-23 | 1952-06-17 | Jr Frank Wesley Moffett | Method of heating frozen food packages |
US2622187A (en) * | 1947-01-14 | 1952-12-16 | Raytheon Mfg Co | Microwave pressure cooker |
US2648047A (en) * | 1945-08-04 | 1953-08-04 | Us Navy | Wave guide calorimeter wattmeter |
US2830162A (en) * | 1954-06-22 | 1958-04-08 | Raytheon Mfg Co | Heating method and apparatus |
US3469053A (en) * | 1965-10-19 | 1969-09-23 | Melvin L Levinson | Microwave kiln |
US3539751A (en) * | 1966-10-26 | 1970-11-10 | Melvin L Levinson | Insulating implement for use in a microwave oven |
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Publication number | Priority date | Publication date | Assignee | Title |
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US2648047A (en) * | 1945-08-04 | 1953-08-04 | Us Navy | Wave guide calorimeter wattmeter |
US2495435A (en) * | 1947-01-14 | 1950-01-24 | Raytheon Mfg Co | Method of treating foodstuffs |
US2622187A (en) * | 1947-01-14 | 1952-12-16 | Raytheon Mfg Co | Microwave pressure cooker |
US2600566A (en) * | 1949-11-23 | 1952-06-17 | Jr Frank Wesley Moffett | Method of heating frozen food packages |
US2830162A (en) * | 1954-06-22 | 1958-04-08 | Raytheon Mfg Co | Heating method and apparatus |
US3469053A (en) * | 1965-10-19 | 1969-09-23 | Melvin L Levinson | Microwave kiln |
US3539751A (en) * | 1966-10-26 | 1970-11-10 | Melvin L Levinson | Insulating implement for use in a microwave oven |
Cited By (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3849622A (en) * | 1969-06-16 | 1974-11-19 | C Merriam | Non-ionic fluid thermometer for microwave oven |
US3941967A (en) * | 1973-09-28 | 1976-03-02 | Asahi Kasei Kogyo Kabushiki Kaisha | Microwave cooking apparatus |
US4027132A (en) * | 1975-04-17 | 1977-05-31 | Levinson Melvin L | Microwave pie baking |
US4190757A (en) * | 1976-10-08 | 1980-02-26 | The Pillsbury Company | Microwave heating package and method |
US4117058A (en) * | 1976-12-03 | 1978-09-26 | General Motors Corporation | Method of making boron containing strontium ferrite |
US4330696A (en) * | 1978-04-17 | 1982-05-18 | Plastics, Inc. | Portable turntable for ovens |
US4886948A (en) * | 1978-04-17 | 1989-12-12 | Plastics, Inc. | Portable turntable with shielded drive motor for microwave ovens |
US4405850A (en) * | 1978-10-06 | 1983-09-20 | Raytheon Company | Combination microwave heating apparatus |
US4306133A (en) * | 1979-02-14 | 1981-12-15 | Levinson Melvin L | Microwave pie baking |
US4239009A (en) * | 1979-08-29 | 1980-12-16 | Plastics, Inc. | Portable turntable for microwave oven |
US4754111A (en) * | 1980-03-18 | 1988-06-28 | Plastics, Inc. | Portable turntable for ovens |
US4398077A (en) * | 1980-10-06 | 1983-08-09 | Raytheon Company | Microwave cooking utensil |
US4362917A (en) * | 1980-12-29 | 1982-12-07 | Raytheon Company | Ferrite heating apparatus |
US4439656A (en) * | 1981-04-06 | 1984-03-27 | The Stouffer Corporation | Apparatus and method for the reconstitution of frozen foods in a microwave oven |
US4803324A (en) * | 1985-02-15 | 1989-02-07 | Sharp Kabushiki Kaisha | Microwave heating and infrared ray heating appliance |
US4870255A (en) * | 1985-02-15 | 1989-09-26 | Sharp Kabushiki Kaisha | Infrared ray heating appliance utilizing a convection fan |
US4822966A (en) * | 1987-02-20 | 1989-04-18 | Yuzuru Matsubara | Method of producing heat with microwaves |
EP0333863A4 (en) * | 1987-08-22 | 1991-07-31 | Shusuke Yano | Far infrared ray generator |
EP0333863A1 (en) * | 1987-08-22 | 1989-09-27 | YANO, Shusuke | Far infrared ray generator |
US4904836A (en) * | 1988-05-23 | 1990-02-27 | The Pillsbury Co. | Microwave heater and method of manufacture |
US5136133A (en) * | 1988-09-28 | 1992-08-04 | Briggs David H | Microwave heating apparatus |
FR2648219A1 (en) * | 1989-01-18 | 1990-12-14 | Cem Corp | Receptacle and method of manufacturing such a receptacle, for incineration in a microwave oven |
FR2641855A1 (en) * | 1989-01-18 | 1990-07-20 | Cem Corp | MICROWAVE INCINERATION AND ANALYSIS APPARATUS COMPONENTS AND METHODS |
US5066843A (en) * | 1989-01-18 | 1991-11-19 | Cem Corporation | Heat resistant and light weight container for materials to be ashed, and process for manufacture thereof |
US5378878A (en) * | 1989-01-18 | 1995-01-03 | Cem Corporation | Heat resistant and light weight container for materials to be heated, and process for manufacture thereof |
AT409322B (en) * | 1989-01-18 | 2002-07-25 | Cem Corp | Heat-resistant container (vessel) for ashable material, and a method for producing the container |
US5272302A (en) * | 1991-12-17 | 1993-12-21 | Raytheon Company | Microwave oven with improved cooking uniformity |
US5519196A (en) * | 1995-06-01 | 1996-05-21 | Xu; Liming | Material for converting microwave energy into thermal energy, and a cooking receptacle fabricated from that material |
US20050211705A1 (en) * | 2004-02-05 | 2005-09-29 | Eiji Nomura | Microwave burning furnace |
US7223950B2 (en) * | 2004-02-05 | 2007-05-29 | Matsushita Electric Industrial Co., Ltd. | Microwave burning furnace including heating element having two types of materials |
US20060289514A1 (en) * | 2005-04-19 | 2006-12-28 | Electrolux Professional Spa | Apparatus for cooking food products on both sides thereof |
US7507939B2 (en) * | 2005-04-19 | 2009-03-24 | Electrolux Professional Spa | Cooking apparatus having a microwave generator |
US20070092609A1 (en) * | 2005-10-26 | 2007-04-26 | H. J. Heinz Company | Food container |
CN102331008A (en) * | 2011-08-12 | 2012-01-25 | 电子科技大学 | Microwave and steam cooking two-purpose microwave oven |
CN102331008B (en) * | 2011-08-12 | 2013-07-17 | 电子科技大学 | Microwave and steam cooking two-purpose microwave oven |
US10791871B2 (en) | 2014-03-17 | 2020-10-06 | Jong Peter Park | Travel mug for microwave oven |
EP3343111A4 (en) * | 2015-11-16 | 2018-11-14 | Samsung Electronics Co., Ltd. | Cooking apparatus, control method therefor and double plate |
US11193676B2 (en) * | 2015-11-16 | 2021-12-07 | Samsung Electronics Co., Ltd. | Cooking apparatus, control method therefor and double plate |
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Legal Events
Date | Code | Title | Description |
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PS | Patent suit(s) filed |