US2993998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor combinations
Assignee: Sprague Electric Co
•
Filing: 1955-06-09
•
Granted: 1961-07-25
•
Expires: 1975-06-09
Abstract
No abstract record available.
Inventors
- 👤 Lehovec Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:32
CPC Classifications
H; H10; H10F; H10F30/00; H10F30/20; H10F30/21; H10F30/28; H10F30/283; H10F30/2843; H10D; H10D99/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2769926A
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US2815303A
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US2863056A
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US2812446A
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US2805347A
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US2828232A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |