Patent US3437889A successfully refreshed from Google Patents.
US3437889A
Expired / Lapsed
US
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Controllable semiconductor element
Assignee: BBC Brown Boveri AG Germany
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Filing: 1966-11-14
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Granted: 1969-04-08
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Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 Edouard Eugster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:35
CPC Classifications
H; H10; H10W; H10W90/00; H10D; H10D99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2879190A
Cited
US3069603A
Cited
US2971139A
Cited
US3018392A
Cited
GB945249A
Cited
US3179860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |