Patent US3664837A successfully refreshed from Google Patents.
US3664837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of a line pattern on a glass plate
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1970-01-16
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Granted: 1972-05-23
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Expires: 1990-01-16
Abstract
Abstract MICREOLECTRONIC CIRCUITS ARE PROCUCED BY EVAPORATING A PHOTOSENSITIVE COMPOUND SUCH AS A SILVER HALIDE ONTO A CHIP WHICH IS THEN EXPOSED TO RADIATION SUCH AS LIGHT, OR AN ELECTRON BEAM WHOSE MOTION MAY BE CONTROLLED BY A COMPUTER OR SIMILAR DEVICE. THE CHIP IS THEN DEVELOPED LEAVING BEHIND THE METALLIC CONDUCTIVE CIRCUIT, AND THE UNDEVELOPED PORTION IS REMOVED PREFERABLY BY HEATING.
Inventors
- 👤 Charles C Stanley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:37
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/496; G03C1/4965; H; H10; H10N; H10N97/00; H05; H05K; H05K3/00; H05K3/10; H05K3/105
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |