Patent US3490140A successfully refreshed from Google Patents.
US3490140A
Expired / Lapsed
US
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Methods for making semiconductor devices
Assignee: AT&T Inc
•
Filing: 1967-10-05
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Granted: 1970-01-20
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Expires: 1987-10-05
Abstract
No abstract record available.
Inventors
- 👤 Stephen Knight
- 👤 Michiyuki Uenohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:21
CPC Classifications
H; H10; H10P; H10P52/00; H10N; H10N80/00; Y; Y10; Y10S; Y10S438/00; Y10S438/90; Y10S438/975; Y10S438/977
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3290753A
Cited
US3391023A
Cited
US3411200A
Cited
US3407479A
Cited
US3400309A
Cited
US3423823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |