DE2120284A1 - Trägermassen für Druckpasten zum Herstellen von feinlinigen mikroelektronischen Schaltungen und daraus hergestellte Pasten - Google Patents
Trägermassen für Druckpasten zum Herstellen von feinlinigen mikroelektronischen Schaltungen und daraus hergestellte PastenInfo
- Publication number
- DE2120284A1 DE2120284A1 DE19712120284 DE2120284A DE2120284A1 DE 2120284 A1 DE2120284 A1 DE 2120284A1 DE 19712120284 DE19712120284 DE 19712120284 DE 2120284 A DE2120284 A DE 2120284A DE 2120284 A1 DE2120284 A1 DE 2120284A1
- Authority
- DE
- Germany
- Prior art keywords
- weight
- printing
- binder
- printing paste
- carrier
- 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.)
- Pending
Links
- 238000007639 printing Methods 0.000 title claims description 48
- 238000004377 microelectronic Methods 0.000 title claims description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000000969 carrier Substances 0.000 title description 2
- 230000009974 thixotropic effect Effects 0.000 claims description 38
- 239000011230 binding agent Substances 0.000 claims description 36
- 239000000463 material Substances 0.000 claims description 34
- 239000000203 mixture Substances 0.000 claims description 26
- 239000011521 glass Substances 0.000 claims description 24
- 239000011149 active material Substances 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 17
- 239000004020 conductor Substances 0.000 claims description 16
- 239000003349 gelling agent Substances 0.000 claims description 13
- 238000011084 recovery Methods 0.000 claims description 11
- 238000010304 firing Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 8
- 239000003989 dielectric material Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000012876 carrier material Substances 0.000 claims description 7
- 230000000284 resting effect Effects 0.000 claims description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 6
- 229910052737 gold Inorganic materials 0.000 claims description 6
- 239000010931 gold Substances 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 4
- 239000000499 gel Substances 0.000 claims description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- 239000004332 silver Substances 0.000 claims description 4
- 239000013008 thixotropic agent Substances 0.000 claims description 4
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 claims description 3
- JUWSSMXCCAMYGX-UHFFFAOYSA-N gold platinum Chemical compound [Pt].[Au] JUWSSMXCCAMYGX-UHFFFAOYSA-N 0.000 claims description 3
- SWELZOZIOHGSPA-UHFFFAOYSA-N palladium silver Chemical compound [Pd].[Ag] SWELZOZIOHGSPA-UHFFFAOYSA-N 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 2
- 239000003599 detergent Substances 0.000 claims 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 11
- 239000004480 active ingredient Substances 0.000 description 11
- 239000001856 Ethyl cellulose Substances 0.000 description 9
- 229920001249 ethyl cellulose Polymers 0.000 description 9
- 235000019325 ethyl cellulose Nutrition 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- VXQBJTKSVGFQOL-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethyl acetate Chemical compound CCCCOCCOCCOC(C)=O VXQBJTKSVGFQOL-UHFFFAOYSA-N 0.000 description 7
- 238000003756 stirring Methods 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- -1 polyoxyethylene Polymers 0.000 description 5
- 230000004304 visual acuity Effects 0.000 description 5
- PMGCQNGBLMMXEW-UHFFFAOYSA-N Isoamyl salicylate Chemical compound CC(C)CCOC(=O)C1=CC=CC=C1O PMGCQNGBLMMXEW-UHFFFAOYSA-N 0.000 description 4
- 229910052797 bismuth Inorganic materials 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- TUFJPPAQOXUHRI-KTKRTIGZSA-N n'-[(z)-octadec-9-enyl]propane-1,3-diamine Chemical compound CCCCCCCC\C=C/CCCCCCCCNCCCN TUFJPPAQOXUHRI-KTKRTIGZSA-N 0.000 description 3
- 239000003960 organic solvent Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000194 fatty acid Substances 0.000 description 2
- 229930195729 fatty acid Natural products 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- OAYXUHPQHDHDDZ-UHFFFAOYSA-N 2-(2-butoxyethoxy)ethanol Chemical compound CCCCOCCOCCO OAYXUHPQHDHDDZ-UHFFFAOYSA-N 0.000 description 1
- 235000013162 Cocos nucifera Nutrition 0.000 description 1
- 244000060011 Cocos nucifera Species 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 238000004354 ROESY-TOCSY relay Methods 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 229910006501 ZrSiO Inorganic materials 0.000 description 1
- XKBMZXXVUXDNLM-UHFFFAOYSA-N [Ag]=O.[Ru] Chemical compound [Ag]=O.[Ru] XKBMZXXVUXDNLM-UHFFFAOYSA-N 0.000 description 1
- UYVZCGGFTICJMW-UHFFFAOYSA-N [Ir].[Au] Chemical compound [Ir].[Au] UYVZCGGFTICJMW-UHFFFAOYSA-N 0.000 description 1
- YPPQDPIIWDQYRY-UHFFFAOYSA-N [Ru].[Rh] Chemical compound [Ru].[Rh] YPPQDPIIWDQYRY-UHFFFAOYSA-N 0.000 description 1
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 150000001346 alkyl aryl ethers Chemical class 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 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
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229940075614 colloidal silicon dioxide Drugs 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 150000001983 dialkylethers Chemical class 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- XXUJMEYKYHETBZ-UHFFFAOYSA-N ethyl 4-nitrophenyl ethylphosphonate Chemical compound CCOP(=O)(CC)OC1=CC=C([N+]([O-])=O)C=C1 XXUJMEYKYHETBZ-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 239000011346 highly viscous material Substances 0.000 description 1
- 229920003063 hydroxymethyl cellulose Polymers 0.000 description 1
- 229940031574 hydroxymethyl cellulose Drugs 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000003317 industrial substance Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- WKMKTIVRRLOHAJ-UHFFFAOYSA-N oxygen(2-);thallium(1+) Chemical compound [O-2].[Tl+].[Tl+] WKMKTIVRRLOHAJ-UHFFFAOYSA-N 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- HWLDNSXPUQTBOD-UHFFFAOYSA-N platinum-iridium alloy Chemical compound [Ir].[Pt] HWLDNSXPUQTBOD-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910003438 thallium oxide Inorganic materials 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
- H05K1/092—Dispersed materials, e.g. conductive pastes or inks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/14—Conductive material dispersed in non-conductive inorganic material
- H01B1/16—Conductive material dispersed in non-conductive inorganic material the conductive material comprising metals or alloys
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Inorganic Chemistry (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00040359A US3830651A (en) | 1970-05-25 | 1970-05-25 | Fine line electronic micro-circuitry printing pastes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE2120284A1 true DE2120284A1 (de) | 1971-12-09 |
Family
ID=21910578
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19712120284 Pending DE2120284A1 (de) | 1970-05-25 | 1971-04-26 | Trägermassen für Druckpasten zum Herstellen von feinlinigen mikroelektronischen Schaltungen und daraus hergestellte Pasten |
| DE19712167018 Pending DE2167018A1 (de) | 1970-05-25 | 1971-04-26 | Verwendung der druckpaste zum herstellen von feinlinigen mikroelektronischen schaltungen |
| DE19712167017 Pending DE2167017A1 (de) | 1970-05-25 | 1971-04-26 | Traegermasse fuer druckpasten |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19712167018 Pending DE2167018A1 (de) | 1970-05-25 | 1971-04-26 | Verwendung der druckpaste zum herstellen von feinlinigen mikroelektronischen schaltungen |
| DE19712167017 Pending DE2167017A1 (de) | 1970-05-25 | 1971-04-26 | Traegermasse fuer druckpasten |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3830651A (enExample) |
| DE (3) | DE2120284A1 (enExample) |
| FR (1) | FR2093648A5 (enExample) |
| GB (1) | GB1358101A (enExample) |
| NL (1) | NL7107119A (enExample) |
| SE (2) | SE394789B (enExample) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4032350A (en) * | 1973-03-12 | 1977-06-28 | Owens-Illinois, Inc. | Printing paste vehicle, gold dispensing paste and method of using the paste in the manufacture of microelectronic circuitry components |
| US3929491A (en) * | 1974-01-24 | 1975-12-30 | Electro Oxide Corp | Bonded silver article, composition, and method of bonding silver to a ceramic substrate |
| US3918980A (en) * | 1974-02-15 | 1975-11-11 | Electro Oxide Corp | Bonded solderable silver article, composition, and method of bonding silver to a ceramic substrate |
| US3929674A (en) * | 1974-06-03 | 1975-12-30 | Du Pont | Boride-containing metallizations |
| US4076894A (en) * | 1974-11-07 | 1978-02-28 | Engelhard Minerals & Chemicals Corporation | Electrical circuit element comprising thick film resistor bonded to conductor |
| US4070200A (en) * | 1976-04-12 | 1978-01-24 | E. I. Du Pont De Nemours And Company | Compositions containing diethylene glycol ether |
| US4230493A (en) * | 1978-09-22 | 1980-10-28 | E. I. Du Pont De Nemours And Company | Gold conductor compositions |
| US4469625A (en) * | 1980-02-25 | 1984-09-04 | E. I. Du Pont De Nemours And Company | Prolonged tack toners for the preparation of electric circuits |
| GB2072707B (en) * | 1980-03-31 | 1984-01-25 | Hitachi Chemical Co Ltd | Electroconductive paste and process for producing electroconductive metallized ceramics using the same |
| JPS5922385B2 (ja) * | 1980-04-25 | 1984-05-26 | 日産自動車株式会社 | セラミツク基板のスル−ホ−ル充填用導電体ペ−スト |
| DE3134586C2 (de) * | 1981-09-01 | 1984-08-16 | Resista Fabrik elektrischer Widerstände GmbH, 8300 Landshut | Verfahren zur Herstellung von Schichtwiderständen mit stabförmigen Trägerkörpern |
| US5306333A (en) * | 1988-06-08 | 1994-04-26 | Quantum Materials, Inc. | Resinless pseudoplastic bonding compositions |
| US5326390A (en) * | 1993-04-05 | 1994-07-05 | E. I. Du Pont De Nemours And Company | Organic vehicle and electronic paste |
| US5783113A (en) * | 1997-03-27 | 1998-07-21 | International Business Machines Corporation | Conductive paste for large greensheet screening including high thixotropic agent content |
| RU2272368C2 (ru) * | 2000-04-14 | 2006-03-20 | Сэн-Гобэн Гласс Франс | Прозрачное основание, снабженное электропроводными дорожками |
| ITMI20010807A1 (it) * | 2000-04-14 | 2002-10-13 | Saint Gobain | Procedimento per la fabbricazione di piste elettroconduttorici sunun substrato trasparente e substrato ottenuto |
| FR2823454B1 (fr) * | 2001-04-17 | 2004-02-20 | Saint Gobain | Procede de fabrication de pistes electroconductrices sur un substrat transparent et substrat obtenu |
| KR102100638B1 (ko) * | 2012-07-30 | 2020-04-14 | 세람테크 게엠베하 | 관통 홀을 금속 피복하는 방법 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3118048A (en) * | 1961-07-18 | 1964-01-14 | Ind Metal Proiectives Inc | Liquid coating composition |
| US3297460A (en) * | 1963-10-07 | 1967-01-10 | Fmc Corp | Phosphate gel compositions |
| US3401126A (en) * | 1965-06-18 | 1968-09-10 | Ibm | Method of rendering noble metal conductive composition non-wettable by solder |
| US3390104A (en) * | 1965-07-16 | 1968-06-25 | Ibm | Electrical resistor compositions, elements and method of making same |
-
1970
- 1970-05-25 US US00040359A patent/US3830651A/en not_active Expired - Lifetime
-
1971
- 1971-04-26 DE DE19712120284 patent/DE2120284A1/de active Pending
- 1971-04-26 DE DE19712167018 patent/DE2167018A1/de active Pending
- 1971-04-26 DE DE19712167017 patent/DE2167017A1/de active Pending
- 1971-05-24 FR FR7118665A patent/FR2093648A5/fr not_active Expired
- 1971-05-24 SE SE7402285A patent/SE394789B/xx unknown
- 1971-05-24 SE SE7106639A patent/SE380039B/xx unknown
- 1971-05-24 GB GB1666571A patent/GB1358101A/en not_active Expired
- 1971-05-25 NL NL7107119A patent/NL7107119A/xx not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| DE2167018A1 (de) | 1977-07-28 |
| SE394789B (sv) | 1977-07-04 |
| DE2167017A1 (de) | 1977-07-28 |
| FR2093648A5 (enExample) | 1972-01-28 |
| NL7107119A (enExample) | 1971-11-29 |
| GB1358101A (en) | 1974-06-26 |
| SE380039B (enExample) | 1975-10-27 |
| US3830651A (en) | 1974-08-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OHW | Rejection |