US3776769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallising pastes
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1971-08-02
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Granted: 1973-12-04
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Expires: 1991-08-02
Abstract
Abstract A metallising paste for screen-printing microcircuitry comprises a heat-vaporizable inert liquid medium containing, in powder form, at least one constituent selected from a noble metal, a noble metal alloy, an oxide of a noble metal and an oxide of a noble metal alloy, at least one constituent selected from copper and copper oxide, and a vitreous binder, the binder having a fusion temperature less than the melting temperature of the noble metal - copper oxide alloy formed on fusing the powder constituents of the paste. The noble metal is usually Ag or Au and the noble metal alloy a Ag-Au alloy.
Inventors
- 👤 R Buck
- 👤 H Barlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:26
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/5127; C04B41/80; C04B41/81; C04B41/85; C04B41/88; H; H01; H01B; H01B1/00; H01B1/14; H01B1/16; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893; Y10T428/24909; Y10T428/24926
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
14 words
A method according to claim 1 in which the replica is formed by screen-printing.
Claim 2
Dependent Claim
25 words
A method according to claim 1 in which the dried replica is fired at not less than the melting temperature of the noble metal constituent.
Claim 3
Dependent Claim
25 words
A method according to claim 2 in which the dried replica is fired at not less than the melting temperature of the noble metal constituent.
Claim 4
Dependent Claim
17 words
A ceramic substrate having an electrically conducting element formed thereon by a method according to claim 1.
Claim 5
Dependent Claim
17 words
A ceramic substrate having an electrically conducting element formed thereon by a method according to claim 2.
References Cited (Backward Citations)
GB739543A
Cited
US2837487A
Cited
US3293501A
Cited
US3440182A
Cited
US3324049A
Cited
US3450545A
Cited
US3620840A
Cited
US3679473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |