Patent US4622240A successfully refreshed from Google Patents.
US4622240A
Expired / Lapsed
US
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Process for manufacturing thick-film electrical components
Assignee: Versum Materials US LLC
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Filing: 1985-11-12
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Granted: 1986-11-11
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Expires: 2005-11-12
Abstract
Abstract Nitrous oxide additions to the furnace atmosphere during firing of thick film electrical components minimizes soot deposition from vaporization of vehicle contained in the film paste.
Inventors
- 👤 Walter F. Yext
- 👤 Edward A. Hayduk
- 👤 Clark K. Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:14
CPC Classifications
B; B05; B05D; B05D5/00; B05D5/12; H; H10; H10D; H10D84/00; H10D84/01; H05; H05K; H05K3/00; H05K3/10; H05K3/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
91 words
In a process of manufacturing thick-film electrical component by forming a paste suitable for application to a ceramic substrate, applying said paste to said substrate by a conventional screen printing technique, drying said printed substrate and firing said substrate and said paste at elevated temperatures to form said electrical component, the improvement comprising: firing said paste and substrate composite in a furnace hot zone maintained at a temperature of between 300° and 1000° C. under an atmosphere of gaseous nitrogen to which is added from 10 to 10,000 ppm nitrous oxide.
Claim 2
Dependent Claim
91 words
In a process of manufacturing thick-film electrical component by forming a paste suitable for application to a ceramic substrate, applying said paste to said substrate by a conventional screen printing technique, drying said printed substrate and firing said substrate and said paste at elevated temperatures to form said electrical component, the improvement comprising: firing said paste and substrate composite in a furnace hot zone maintained at a temperature of between 300° and 1000° C. under an atmosphere of gaseous nitrogen to which is added from 10 to 10,000 ppm nitrous oxide.
Claim 3
Dependent Claim
30 words
A process according to claim 1 wherein a multi-zone furnace is used and said nitrous oxide is maintained throughout said furnace at a level of between 10 and 3,000 ppm.
Claim 4
Dependent Claim
39 words
A process according to claim 1 wherein said furnace has a preheat zone maintained at a temperature of from 22° C. to 850° C. and a hot zone maintained at a temperature of from 300° C. to 1000° C.
Claim 5
Dependent Claim
45 words
A process according to claim 3 wherein nitrous oxide is injected into said furnace so that the nitrous oxide is present in the preheat zone of said furnace in an amount between 10 and 10,000 ppm and up to 3000 ppm in said hot zone.
Claim 6
Dependent Claim
28 words
A process according to claim 3 wherein nitrous oxide is injected into the preheat zone of said furnace to a maximum of 10,000 ppm in said furnace atmosphere.
Claim 7
Dependent Claim
27 words
A process according to claim 5 wherein water is injected into said hot zone to provide water vapor in said atmosphere at a level below 2500 ppm.
Claim 8
Dependent Claim
14 words
A process according to claim 1 wherein said thick-film electrical component is a resistor.
Claim 9
Dependent Claim
13 words
A process according to claim 1 wherein said thick-film electrical component is conductor.
Claim 10
Dependent Claim
13 words
A process according to claim 1 wherein said thick-film electrical component is dielectric.
Claim 11
Dependent Claim
35 words
A process according to claim 1 wherein said thick-film electrical composite is formed from a paste containing a noble metal selected from the group consisting essentially of gold, silver, platinum, palladium, ruthenium or mixtures thereof.
Claim 12
Dependent Claim
20 words
A process according to claim 1 wherein said thick-film electrical component is formed from a paste containing a base metal.
Claim 13
Dependent Claim
12 words
A process according to claim 10 wherein said base metal is copper.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-10 | 1990-05-12 | 1990-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-10 | 1994-05-12 | 1994-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-10 | 1998-05-12 | 1998-11-11 | $7700.00 | Window Closed / Lapsed |