Patent US3681135A successfully refreshed from Google Patents.
US3681135A
Expired / Lapsed
US
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Printed circuits and method of making same
Assignee: ZF International UK Ltd
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Filing: 1970-06-24
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Granted: 1972-08-01
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Expires: 1990-06-24
Abstract
Abstract ELECTRICAL PRINTED CIRCUITS FORMED BY APPLYING TRO AN ALUMINA SUBSTRATE A CONDUCTIVE INK COMPRISING A MIXTURE OF APPROXIMATELY 5% BY WEIGHT OF TITANIUM HYDRIDE, 10% BY WEIGHT OF LEAD, WITH THE REMAINDER BEING A MIXTURE OF COPPER AND GOLD, THE COPPER RANGING BETWEEN 50% AND 80% BY WEIGHT OF THE WHOLE INK MIX AND THE GOLD RANGING BETWEEN 5% AND 20% BY WEIGHT OF THE WHOLE INK MIX, AND AN ORGANIC BINDER, AND FIRING SAID CONDUCTIVE INK ONTO SAID SUBSTRATE.
Inventors
- 👤 Walter Graham Cheary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:34
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H01; H01B; H01B1/00; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24926
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |