US3535772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device fabrication processes
Assignee: AT&T Inc
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Filing: 1968-03-25
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Granted: 1970-10-27
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Expires: 1988-03-25
Abstract
No abstract record available.
Inventors
- 👤 Stephen Knight
- 👤 Terence J Riley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:31
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/10; H10N; H10N80/00; H10P; H10P14/00; H10P14/20; H10P14/26; H10P14/263; H10P14/265; H10P14/27; H10P14/271; H10P14/34; H10P14/3402; H10P14/3414; H10P14/3421; Y; Y10; Y10S; Y10S148/00; Y10S148/107; Y10S438/00; Y10S438/90; Y10S438/955
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-26 | 1974-04-27 | 1974-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-26 | 1978-04-27 | 1978-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-26 | 1982-04-27 | 1982-10-27 | $7700.00 | Window Closed / Lapsed |