Patent US2566057A successfully refreshed from Google Patents.
US2566057A
Expired / Lapsed
US
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Audio amplifier system
Assignee: General Electric Co
•
Filing: 1947-10-02
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Granted: 1951-08-28
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Expires: 1967-10-02
Abstract
No abstract record available.
Inventors
- 👤 George F Devine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:36
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36; Y; Y10; Y10S; Y10S84/00; Y10S84/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB447622A
Cited
US2190743A
Cited
US2186571A
Cited
GB506652A
Cited
US2252007A
Cited
US2246158A
Cited
US2331708A
Cited
US2372956A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |