WO1999000533A1 - Gas injection disc assembly for cvd applications - Google Patents
Gas injection disc assembly for cvd applications Download PDFInfo
- Publication number
- WO1999000533A1 WO1999000533A1 PCT/US1998/013037 US9813037W WO9900533A1 WO 1999000533 A1 WO1999000533 A1 WO 1999000533A1 US 9813037 W US9813037 W US 9813037W WO 9900533 A1 WO9900533 A1 WO 9900533A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- insert
- gas
- outer ring
- injection disc
- plenum
- Prior art date
Links
- 238000002347 injection Methods 0.000 title claims abstract description 80
- 239000007924 injection Substances 0.000 title claims abstract description 80
- 238000007789 sealing Methods 0.000 claims abstract description 51
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000010168 coupling process Methods 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 238000005229 chemical vapour deposition Methods 0.000 claims description 15
- 239000000758 substrate Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 4
- CPTCUNLUKFTXKF-UHFFFAOYSA-N [Ti].[Zr].[Mo] Chemical compound [Ti].[Zr].[Mo] CPTCUNLUKFTXKF-UHFFFAOYSA-N 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 2
- 229910001182 Mo alloy Inorganic materials 0.000 claims 2
- 239000012530 fluid Substances 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 106
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 8
- 238000004140 cleaning Methods 0.000 abstract description 4
- 238000003780 insertion Methods 0.000 abstract description 3
- 230000037431 insertion Effects 0.000 abstract description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 26
- 229910052739 hydrogen Inorganic materials 0.000 description 11
- 239000001257 hydrogen Substances 0.000 description 11
- 229910003460 diamond Inorganic materials 0.000 description 10
- 239000010432 diamond Substances 0.000 description 10
- 229930195733 hydrocarbon Natural products 0.000 description 10
- 150000002430 hydrocarbons Chemical class 0.000 description 10
- 239000004215 Carbon black (E152) Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 238000005219 brazing Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 150000001723 carbon free-radicals Chemical class 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000376 reactant Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- YZCKVEUIGOORGS-UHFFFAOYSA-N Hydrogen atom Chemical compound [H] YZCKVEUIGOORGS-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- -1 methane Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007725 thermal activation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45563—Gas nozzles
- C23C16/4558—Perforated rings
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/50—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges
- C23C16/513—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using electric discharges using plasma jets
Definitions
- This invention relates broadly to a chemical vapor deposition system. More particularly, this invention relates to the gas injection disc in a plasma jet chemical vapor deposition system.
- diamond has the highest room-temperature thermal conductivity of any material, a high electric field breakdown ( ⁇ 10 7 V/cm) , and an air stable negative electron affinity. These properties make possible high power, high frequency transistors and cold cathodes, which cannot be made with any semiconductor other than diamond.
- CVD' chemical vapor deposition
- a mixture of hydrogen and a gaseous hydrocarbon, such as methane is activated and contacted with a substrate to produce a diamond film on the substrate.
- the hydrogen gas is disassociated into atomic hydrogen, which is then reacted with the hydrocarbon to form condensable carbon radicals including elemental carbon.
- the carbon radicals are then deposited on a substrate to form a diamond film.
- Some CVD methods use a hot filament, typically at temperatures up to 2000°C, to provide the thermal activation temperatures necessary to bring about the conversion described above.
- Other CVD methods use a plasma jet.
- hydrogen gas is introduced into a plasma torch which produces a hydrogen plasma jet by means of a direct current arc (hereinafter "DC arc") , or an alternating current arc (“AC arc”), or microwave energy.
- DC arc direct current arc
- AC arc alternating current arc
- the plasma torch is hot enough to reduce gases to their elemental form.
- the energy level of the plasma jet has a tendency to fluctuate.
- One method of stabilizing the energy level of the plasma is to utilize a vortex design in the CVD system. Tangential injection of the hydrogen gas into the arc processor may be used to impart the vortex to the hydrogen, in gaseous and atomic form.
- the vortex design results in a controlled swirl of plasma.
- Hydrogen gas is introduced into the plasma jet and some of the hydrogen gas is thereby disassociated into monatomic hydrogen.
- the hydrogen in both elemental and molecular states, swirling according to the swirl of the plasma, is forced through a downstream injector system which introduces jets of hydrocarbon needed to react with the elemental hydrogen to form diamond films.
- a prior art DC arc plasma jet system 10 is shown.
- the system includes an engine 11 having a hydrogen gas inlet 12, a cathode 14, an engine wall 16, an insulative lining 18 on the engine wall, and an anode 20.
- the system 10 further includes a gas injection disc 22, a nozzle 24 directed toward a substrate (not shown) , and a vacuum chamber 25 which surrounds the engine 11, the gas injection disc 22, the nozzle 24, and the substrate.
- the gas injection disc 22 is provided with a plurality of radially-positioned gas injectors 2 ⁇ a-26h (shown only with respect to 26a in Fig. 1), a toroidal plenum 27 surrounding the injectors 26a-h which feeds gas into the injectors, and two L-shaped gas injectant ports 28a, 28b (only 28a shown in Fig. 1) which radially feed gas into the plenum 27 from gas supply feeds (not shown) attached to the underside of the gas injection disc.
- the gas supply feeds must be attached to the underside of the gas injection disc, rather than to the periphery, because the space within the chamber 25 around the gas injection disc 22 is not sufficient to peripherally mount the gas supply feeds .
- each L-shaped port 28a, 28b In order to form each L-shaped port 28a, 28b to which the gas supply feeds are mounted, two holes must be drilled; one radial from the periphery of the gas injection disc and the other from underneath the gas injection disc to intersect the radial hole.
- the peripheral portion of the radial holes are plugged with sealing plugs 30a, 30b (only 30a shown in Fig. 1) to form the L- shaped port and then brazed to prevent gas leaks around the sealing plugs 30a, 30b.
- Bores 31a-d (only 31a shown in Fig. 1) permit mounting hardware (not shown) to extend from the nozzle 24 through the gas injection disc 22 to a support (not shown) .
- the gas injection disc includes an inner cylindrical disc 32 having the gas injectors 26a-h bored therein and a central bore 34.
- a relatively larger outer ring 36 is provided with the injectant ports 28a, 28b and sealing plugs 30a, 30b.
- the inner disc 32 and outer ring 36 are brazed together (see Figure 1) to form the composite gas injection disc 22.
- each injector is machined to exacting tolerances to include a relatively large diameter inlet hole 38 and a relatively small diameter injection hole 40.
- the hydrogen gas enters the hydrogen gas inlet 12 and is heated to a partial plasma state by an arc across the cathode 14 and the anode 20.
- the arc is controlled by solenoids (not shown) surrounding the engine 11.
- the tangential injection of the hydrogen contains the plasma and imparts the vortex swirl to the plasma.
- hydrocarbon injectant and carrier hydrogen gas enter from the gas supply feed into the injectant ports 28a, 28b, and out of the injectors 26a, 26b into the central bore 34.
- the injectant mixes and reacts with the hydrogen plasma in the central bore 34, resulting in a mixture of molecular hydrogen, atomic hydrogen and carbon radicals which exits through the nozzle 24.
- Another problem with the prior art gas injection disc is that the braze work required to form the inner disc 32 and outer ring 34 into a composite unit is a long process, sometimes requiring several months. Complicating matters is that even after several months of manufacturing time, the resulting gas injection disc can be unacceptable due to poor quality brazing.
- One common problem is leakage in the gas injection disc at the braze joint between the outer ring and inner disc and at the braze joint between the gas injectant ports and sealing plugs.
- brazed gas injection discs are unsuitable for experimentation due to their lack of flexibility.
- the entire brazed assembly must be replaced.
- an expensive collection of differently configured injector discs must be maintained on hand for typical experimental programs .
- a gas injection disc which includes an outer ring and a tubular modular insert which slips into the outer ring.
- the outer ring is provided with an inner bore, a ring-shaped plenum located around the inner bore, an outer gas sealing surface having portions above and below the plenum, and preferably at least two gas feed paths extending from the periphery of the outer ring to the plenum.
- the gas feed paths are each provided with a gas feed attachment for coupling gas supply tubes thereto.
- the insert is provided with a plurality of radially aligned injectant holes, an inner gas sealing surface, and an axial bore.
- the insert is seated in the inner bore of the outer ring such that the inner and outer gas sealing surface face each other with a small gap provided therebetween which enables the insertion of the insert into the inner bore.
- the insert thereby substantially encloses the plenum, and the injectant holes are centrally aligned with the plenum to receive injectant gases and direct the injectant gases into the axial bore of the insert.
- the heat generated by the arc jet causes the insert to expand and eliminate the gap between the inner and outer sealing surfaces to thereby prevent undesirable gas leakage.
- the insert is permitted to cool and contract and return to its cooled dimensions, thereby regenerating the small gap between the insert and the outer ring.
- the insert, unencumbered by the outer ring, may then be removed for cleaning or for replacement with an insert having different characteristics.
- Figure 1 is a broken 135°-sectional (as indicated by line 1-1 in Figure 2) view of the prior art plasma injection system
- Figure 2 is a cross-section through the prior art gas injection disc
- Figure 3 is a broken sectional view of the prior art injector design
- Figure 4 is a broken sectional view of a plasma injection system according to the invention.
- Figure 5 is a transparent top view of a first embodiment of a gas injection disc assembly according to the invention.
- Figure 6 is a cross-section through line 5-5 in Figure 4;
- Figure 7 is a view similar to Figure 5 in which the gas injection disc assembly is in a heated state;
- Figure 8 is a view similar to Figure 7 of a second embodiment of a gas injection disc assembly according to the invention.
- Figure 9 is a partial view of an insert for a gas injection disc assembly according to a third embodiment of the invention.
- Figure 10 is a section view of the insert of Figure 9.
- a plasma jet system 50 for a plasma jet CVD system includes an engine 51 having an engine wall 54, a hydrogen gas inlet 52 for the passage of hydrogen gas through the engine wall 54, a cathode 56 located at an upper portion of the engine 11, and an anode 58 located at the bottom portion of the engine 11.
- the modular gas injection disc 100 of the invention is positioned adjacent the anode 58, and the nozzle 60 is positioned under the gas injection disc.
- a vacuum chamber 61 surrounds the engine 11, the gas injection disc 100, the nozzle 60, and a substrate (not shown) located beneath and in the path of the nozzle.
- Hydrogen gas enters the hydrogen gas inlet 52 and is heated into a plasma jet by an arc across the cathode 56 and the anode 58.
- the arc is controlled by solenoids (not shown) surrounding the engine wall 54.
- the injection of the hydrogen gas and the applied magnetic field contain the plasma and impart a vortex swirl to the plasma.
- hydrocarbon and carrier hydrogen gas are injected into the plasma swirl, forming a reactant mixture of hydrocarbon and hydrogen.
- the reactant mixture flows out through a nozzle 60, where a reactant mixture of hydrocarbon and hydrogen is directed toward the substrate.
- the gas injection disc assembly 100 generally includes an outer ring 102 and a tubular modular insert 104 which slips into the outer ring.
- the outer ring 102 and insert 104 are preferably both made of a titanium zirconium molybdenum (TZM) alloy.
- Other materials can be used for the outer ring and insert, although preferably the coefficient of expansion of the material used for the outer ring is substantially equal to the coefficient of expansion of the material used for the insert.
- the outer ring 102 is provided with an upper surface 105, a ring-shaped plenum 108 located around an inner bore 106, two diametrically opposed gas feed paths 112, 114 (injector bodies) extending from the periphery of the outer ring to the plenum 108, and an outer gas sealing surface 110 having portions above and below the plenum 108.
- the gas feed paths 112, 114 are each provided with a coaxial gas feed attachment points 116, 118 (e.g., an internal thread) for coupling gas supply tubes (not shown) thereto.
- the insert 104 is provided with an axial bore 120, a plurality of radially-aligned and cylindrically-bored injectant holes 122a-h, an upper lip 124, and an inner gas sealing surface 126.
- the insert 104 is seated in the inner bore 106 of the outer ring 102 such that the upper lip 124 of the insert 104 rests on the upper surface 105 of the outer ring.
- the inner and outer gas sealing surfaces 110, 126 thereby face each other such that a small gap 128 ( Figure 6) is provided therebetween.
- the insert 104 thereby substantially encloses the plenum 108, and the injectant holes 122a-e are aligned with the plenum 108 to receive injectant gases and to direct the injectant gases into the axial bore 120 of the insert.
- the outer ring 102 preferably has a maximum outer diameter of approximately three and one-quarter inches and an inner bore 106 diameter of approximately one inch.
- the insert 104 preferably has an outer diameter (at the inner sealing surface 126) of approximately one inch, and the diameter of the axial bore 120 is approximately three-quarter inches.
- the size of the outer diameter of the insert is dependent on the size of the diameter of the inner bore outer ring.
- the size of the bores are application dependent and can vary.
- the size, number, and configuration of injector holes are determined by the desired volumetric flow rate of injectant gases for a particular application. It will be appreciated by those skilled in the art that exact dimensions, close tolerances, and polished inner and outer sealing surfaces provide the capability of the self- sealing modular gas injection disc assembly of the invention, as described below.
- the gas then flows out of the injectant holes 122a-h in a direction perpendicular to the axis of the bore 120, and mixes with the hydrogen plasma, according to the CVD process as described above in the Background of the Invention.
- the insert 104 is permitted to cool and contract and return to its cooled dimensions ( Figure 5) unencumbered by the outer ring 102.
- the insert is not brazed to the outer ring, the insert and outer ring may contract independently during cooling. As a result, the gas feed paths and injectant holes are not subject to the stresses responsible for cracking.
- the gas injection disc assembly does not require the expensive, unreliable, and ⁇ lengthy process of brazing for sealing the surfaces that form the gas plenum.
- inspection and cleaning of the gas feed paths and injectant holes can be more thorough and accurate than with conventional injectors, as the insert can be removed.
- Injectant hole sizes can be checked using gauge pins entering from the plenum side, rather than from the axial bore side, ensuring that no debris or crystallized graphite deposits are pushed back into the injectant holes obstructing gas flow.
- the inserts are also easy to handle and precise measurements can be performed thereon using calipers and micrometers in locations that would otherwise be impossible to access. Moreover, it is relatively easy to remove the insert for cleaning in an ultrasonic bath. Fourth, the machining time for generating the gas injection disc of the invention is reduced to several days, rather than the typical several months required for a conventional gas injection disc.
- the inserts may be replaced as soon as indications of normal wear become apparent.
- Sixth due to the modular design of the insert, a variety of experimental versions of the inserts each having unique characteristic, e.g., having variations of injection hole location, size, and shape, can be utilized with minimal associated cost .
- the gas injection disc can be made with a smaller diameter (up to one inch smaller) than possible in prior art designs. Therefore, room is provided in the vacuum chamber to peripherally mount the gas feed attachment means, thereby eliminating the need for L- shaped injectant ports and further eliminating the need for brazing potentially leaky sealing plugs at injectant ports.
- FIG 8 a second preferred embodiment of a gas injection disc assembly 200, substantially similar to the first embodiment (in which like parts have similar numbers incremented by 100), is shown.
- the outer ring 202 is provided with a stepped inner bore 206 defined by a stepped first sealing surface 210.
- the stepped first sealing surface 210 has an upper portion 230 of a particular height and diameter and a lower portion 232 of another height and diameter.
- the diameter " of the stepped bore 206 at the upper portion 230 is greater than the diameter of the stepped bore at the lower portion 232.
- the insert 204 is correspondingly provided with a stepped peripheral second sealing surface 226 having an upper portion 234 and a lower portion 236; the upper portion 234 having a relatively larger outer diameter than the lower portion 236.
- the upper portion 234 of the sealing surface 226 of the insert 204 has substantially the same height and diameter as the upper portion 230 of the sealing surface 210 of the outer ring 202.
- the lower portion 236 of the sealing surface 226 of the insert 204 has substantially the same diameter as the lower portion of the outer ring 202.
- the lower portion of the second sealing surface has a height approximately equal to the height of the outer ring 202 less the height of the upper portion 234 of the second sealing surface 226.
- the stepped insert 204 has a reduced likelihood of binding during insertion into and removal from the stepped bore 206 of the outer ring 202 when residues associated with injectant may otherwise hinder the slip fit between the sealing surfaces 210, 226.
- FIG. 9 a third preferred embodiment of the invention, substantially similar to the first embodiment (with like parts having numbers incremented by 200) is shown.
- the insert 304 is provided with a plurality of injectant holes 322a-h which are non-radially aligned.
- the injectant holes are laterally angled, each by the same angle, to inject injectant counter to the swirl of the plasma. Preferred angles are 20° to 40°, with 30° being most preferable.
- the injectant holes 322a-h are angled relative to the horizontal.
- the injectant holes are angled downward by 1° to 10° (i.e., toward the nozzle), with 5° being most preferable.
- the injector holes may be frustoconical in shape and/or angled other than perpendicular relative to the axial bore of the insert.
- the insert e.g., stepped and non-stepped inserts, radial and non-radial injectant holes, horizontally angled injectant holes, etc.
- various combinations of the configurations e.g., a stepped insert having non-radial and horizontally angled injectant holes
- gas feed paths are shown to extend radially peripheral, it will be appreciated that the gas feed paths may alternatively be L-shaped.
- the gas injection disc assembly has been described with respect to a CVD arc jet plasma system for injecting hydrocarbons in the process of diamond film deposition, it will be appreciated that the gas injection disc assembly may be used for injecting gases other than hydrocarbons for making films other than diamond films. It will therefore be appreciated by those skilled in the art that yet other modifications could be made to the provided invention without deviating from its spirit and scope as so claimed.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98931509A EP0991792B1 (en) | 1997-06-26 | 1998-06-22 | Gas injection disc assembly for cvd applications |
DE69804614T DE69804614T2 (en) | 1997-06-26 | 1998-06-22 | DISC ARRANGEMENT FOR GAS INJECTION IN CVD APPLICATIONS |
JP50566099A JP2002508808A (en) | 1997-06-26 | 1998-06-22 | Gas injection disk assembly for CVD |
CA002295180A CA2295180C (en) | 1997-06-26 | 1998-06-22 | Gas injection disc assembly for cvd applications |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/883,020 US5846330A (en) | 1997-06-26 | 1997-06-26 | Gas injection disc assembly for CVD applications |
US08/883,020 | 1997-06-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999000533A1 true WO1999000533A1 (en) | 1999-01-07 |
Family
ID=25381825
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/013037 WO1999000533A1 (en) | 1997-06-26 | 1998-06-22 | Gas injection disc assembly for cvd applications |
Country Status (6)
Country | Link |
---|---|
US (1) | US5846330A (en) |
EP (1) | EP0991792B1 (en) |
JP (1) | JP2002508808A (en) |
CA (1) | CA2295180C (en) |
DE (1) | DE69804614T2 (en) |
WO (1) | WO1999000533A1 (en) |
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- 1998-06-22 WO PCT/US1998/013037 patent/WO1999000533A1/en active IP Right Grant
- 1998-06-22 DE DE69804614T patent/DE69804614T2/en not_active Expired - Fee Related
- 1998-06-22 JP JP50566099A patent/JP2002508808A/en active Pending
- 1998-06-22 CA CA002295180A patent/CA2295180C/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
DE69804614T2 (en) | 2002-11-21 |
EP0991792B1 (en) | 2002-04-03 |
US5846330A (en) | 1998-12-08 |
JP2002508808A (en) | 2002-03-19 |
EP0991792A1 (en) | 2000-04-12 |
DE69804614D1 (en) | 2002-05-08 |
CA2295180A1 (en) | 1999-01-07 |
CA2295180C (en) | 2003-11-04 |
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