US3538401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drift field thyristor
Assignee: Westinghouse Electric Corp
•
Filing: 1968-04-11
•
Granted: 1970-11-03
•
Expires: 1988-04-11
Abstract
No abstract record available.
Inventors
- 👤 Chang K Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:09
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/60; H10D62/10; H10D62/17; H10D62/192; H10D62/199; H10D62/206; Y; Y10; Y10S; Y10S148/00; Y10S148/049; Y10S148/051
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2899652A
Cited
US3059123A
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US3040219A
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US2981874A
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US3074826A
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US3231796A
Cited
US3411054A
Cited
US3270293A
Cited
US3422322A
Cited
US3463972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |