US3764424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of gallium arsenide devices
Assignee: AT&T Inc
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Filing: 1971-05-03
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Granted: 1973-10-09
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Expires: 1991-05-03
Abstract
Abstract A PROCESS IS DESCRIBED FOR THE FABRICATION OF GALLIUM ARSENIDE DEVICES IN WHICH CHEMICAL POLISHING IS CARRIED OUT ON THE (111) GA-RICH USING A PH ADJUSTED PEROXIDE POLISHING SOLUTION. THIS POLISHING AGENT PRODUCES PARTICULARLY HIGH QUALITY SURFACES WHICH IS DIFFUCLT TO ACHIEVE ON THE (111) GA-RICH FACE USING CONVENTIONAL POLISHING AGENTS.
Inventors
- 👤 A Sayko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:12
CPC Classifications
H; H10; H10H; H10H20/00; H10H20/01; H10H20/011; H10H20/013; H10P; H10P52/00; H10P52/40; H10P52/402
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |