US3047736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor switching amplifier
Assignee: Warren Manufacturing Co Inc
•
Filing: 1957-12-02
•
Granted: 1962-07-31
•
Expires: 1977-12-02
Abstract
No abstract record available.
Inventors
- 👤 Warren J Dornhoefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:26
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02; H04M19/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2536641A
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US2666818A
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US2667632A
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US2835748A
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US2784262A
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US2791645A
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US2821639A
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US2811643A
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US2761917A
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US2804547A
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US2862171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-30 | 1966-01-29 | 1966-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-30 | 1970-01-29 | 1970-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-30 | 1974-01-29 | 1974-07-31 | $7700.00 | Window Closed / Lapsed |