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Patent US2979644A successfully refreshed from Google Patents.
US2979644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection for semiconductor power diodes
Assignee: Chase Shawmut Co
•
Filing: 1960-05-13
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Granted: 1961-04-11
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Expires: 1980-05-13
Abstract
No abstract record available.
Inventors
- 👤 Salzer Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:58
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/40; H10W40/47; H01; H01H; H01H85/00; H01H85/02; H01H85/47; H10W90/00; Y; Y10; Y10S; Y10S165/00; Y10S165/905
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |