Patent US2930989A successfully refreshed from Google Patents.
US2930989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocking transistor oscillators and amplifiers
Assignee: Individual
•
Filing: 1957-04-01
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Granted: 1960-03-29
•
Expires: 1977-04-01
Abstract
No abstract record available.
Inventors
- 👤 Harold M Krieger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:27
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2300916A
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US2358297A
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US2582603A
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US2488169A
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US2447304A
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US2701309A
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US2727146A
Cited
US2681996A
Cited
US2745012A
Cited
US2843744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |