Patent US3497775A successfully refreshed from Google Patents.
US3497775A
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Control of inversion layers in coated semiconductor devices
Assignee: Hitachi Ltd
•
Filing: 1967-08-09
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Granted: 1970-02-24
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Expires: 1987-08-09
Abstract
No abstract record available.
Inventors
- 👤 Minoru Ono
- 👤 Takahisa Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:21
CPC Classifications
H; H10; H10D; H10D99/00; H10P; H10P95/00; H10P32/00; H10P32/10; H10P32/14; H10P32/1408; H10P32/141; H10P32/17; H10P32/171; Y; Y10; Y10S; Y10S148/00; Y10S148/045; Y10S438/00; Y10S438/91; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12528; Y10T428/12535; Y10T428/12583; Y10T428/1259; Y10T428/12674
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2791758A
Cited
US3206670A
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US3056888A
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US3197681A
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US3226611A
Cited
US3419766A
Cited
US3365793A
Cited
US3357902A
Cited
US3336661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-23 | 1973-08-25 | 1974-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-23 | 1977-08-25 | 1978-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-23 | 1981-08-25 | 1982-02-24 | $7700.00 | Window Closed / Lapsed |