Patent US2179260A successfully refreshed from Google Patents.
US2179260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio frequency amplifier
Assignee: RCA Corp
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Filing: 1938-04-30
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Granted: 1939-11-07
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Expires: 1958-04-30
Abstract
No abstract record available.
Inventors
- 👤 Mack C Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:44
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/08; H03F1/34; H03F1/36; H03G; H03G5/00; H03G5/02; H03G5/04; H03G5/06; H03G5/08; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1607; H04B1/1623
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-11-06 | 1943-05-08 | 1943-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-11-06 | 1947-05-08 | 1947-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-11-06 | 1951-05-08 | 1951-11-07 | $7700.00 | Window Closed / Lapsed |