Patent US3426255A successfully refreshed from Google Patents.
US3426255A
Expired / Lapsed
US
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Field effect transistor with a ferroelectric control gate layer
Assignee: Siemens AG
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Filing: 1966-06-29
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Granted: 1969-02-04
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Expires: 1986-06-29
Abstract
No abstract record available.
Inventors
- 👤 Walter Heywang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:21
CPC Classifications
H; H10; H10D; H10D99/00; H10D30/00; H10D30/60; H10D30/701; H10D62/00; H10D62/80; H10D62/86; H10D62/8603; H10D64/00; H10D64/60; H10D64/64
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) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |