US2980831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for reducing surface recombination
Assignee: Sprague Electric Co
•
Filing: 1957-11-21
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Granted: 1961-04-18
•
Expires: 1977-11-21
Abstract
No abstract record available.
Inventors
- 👤 Lehovec Kurt
- 👤 Zuleeg Rainer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:10
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/40; H10P14/46; H10D; H10D99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2646609A
Cited
US2794863A
Cited
US2699594A
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US2842723A
Cited
US2778885A
Cited
US2798189A
Cited
US2842668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |