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Patent US3726006A successfully refreshed from Google Patents.
US3726006A
Expired / Lapsed
US
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Method for sintering thick-film oxidizable silk-screened circuitry
Assignee: United States Department of the Army
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Filing: 1971-04-28
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Granted: 1973-04-10
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Expires: 1991-04-28
Abstract
Abstract A method for sintering thick-film oxidizable silk-screened circuitry comprising printing a glass land surrounding the microcircuit, thereby forming a bridge, on the substrate and covering the same with a glass plate in a non-oxidizing atmosphere, and sintering the same is disclosed.
Inventors
- 👤 W Muckelroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:17
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/12; H05K3/1283; H05K3/1291; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/017; H05K2201/09; H05K2201/09818; H05K2201/09909; H05K2203/00; H05K2203/08; H05K2203/086; H05K2203/11; H05K2203/1126; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155; Y10T29/49163
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
128 words
A method of making thick-film oxidizable circuitry comprising the steps of printing a conductive circuit of an oxidizing metal on a ceramic substrate, printing a glass land about the periphery thereof, placing a cover plate onto said glass land while maintaining the same in a non-oxidizing atmosphere, thereby sealing said conductive circuit from the outside atmosphere, and firing the resulting assembly, said cover plate having a thermal coefficient of expansion less than that of said substrate, and further including applying a metal strip over said glass land prior to placing said cover plate thereonto such that one end of said metal strip is in contact with at least a portion of said conductive circuit and the other end of said metal strip extends externally of said resulting assembly.
Claim 2
Dependent Claim
12 words
A method according to claim 1 wherein said oxidizing metal is copper.
Claim 3
Dependent Claim
12 words
A method according to claim 1 wherein said ceramic substrate is alumina.
Claim 4
Dependent Claim
14 words
A method according to claim 1 wherein said non-oxidizing atmosphere consists essentially of nitrogen.
Claim 5
Dependent Claim
26 words
A method according to claim 1 wherein a matching glass land is printed on said cover plate prior to loacing the same onto said circuit board.
Claim 6
Dependent Claim
26 words
A method according to claim 6 wherein said matching glass land is at least partially viscous when said cover plate is applied to said circuit board.
Claim 7
Dependent Claim
14 words
A method according to claim 1 wherein said cover plate is a glass plate.
Claim 8
Dependent Claim
25 words
A method according to claim 8 wherein said cover plate is made of a member selected from the group consisting of quartz and borosilicate glasses.
Claim 9
Dependent Claim
12 words
A method according to claim 2 wherein said oxidizing metal is copper.
Claim 10
Dependent Claim
12 words
A method according to claim 2 wherein said ceramic substrate is alumina.
Claim 11
Dependent Claim
14 words
A method according to claim 2 wherein said non-oxidizing atmosphere consists essentially of nitrogen.
Claim 12
Dependent Claim
26 words
A method according to claim 2 wherein a matching glass land is printed onto said cover plate prior to loading the same onto said circuit board.
Claim 13
Dependent Claim
26 words
A method according to claim 13 wherein said matching glass land is at least partially viscous when said cover plate is applied to said circuit board.
Claim 14
Dependent Claim
14 words
A method according to claim 2 wherein said cover plate is a glass plate.
Claim 15
Dependent Claim
26 words
A method according to claim 15 wherein said cover plate is made of of a member selected from the group consisting of quartz and borosilicate glasses.
References Cited (Backward Citations)
US3435516A
Cited
US3290569A
Cited
US3404319A
Cited
US3374400A
Cited
US3404215A
Cited
US3648357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |