Patent US2563773A successfully refreshed from Google Patents.
US2563773A
Expired / Lapsed
US
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Audio-frequency amplifier
Assignee: Sonotone Corp
•
Filing: 1946-07-30
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Granted: 1951-08-07
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Expires: 1966-07-30
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Crownover
- 👤 Heiman W Koren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:33
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/04; H04; H04R; H04R25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2083626A
Cited
US2120995A
Cited
US2096625A
Cited
US2103490A
Cited
US2182329A
Cited
US2369030A
Cited
US2468082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |