US2802907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distortionless audio amplifier
Assignee: General Radio Co
•
Filing: 1951-01-22
•
Granted: 1957-08-13
•
Expires: 1971-01-22
Abstract
No abstract record available.
Inventors
- 👤 Arnold P G Peterson
- 👤 Donald B Sinclair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:49
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/42; H03F3/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1999327A
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US2423931A
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US2428295A
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US2310342A
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US2488567A
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US2446025A
Cited
US2477074A
Cited
US2659775A
Cited
US2561425A
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US2646467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |