Patent US2766331A successfully refreshed from Google Patents.
US2766331A
Expired / Lapsed
US
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Audio compressor circuit
Assignee: Collins Radio Co
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Filing: 1953-01-26
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Granted: 1956-10-09
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Expires: 1973-01-26
Abstract
No abstract record available.
Inventors
- 👤 William P Birkemeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:15
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1869331A
Cited
US2375283A
Cited
US2315042A
Cited
US2273107A
Cited
GB572216A
Cited
US2540313A
Cited
US2630498A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-09 | 1960-04-09 | 1960-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-09 | 1964-04-09 | 1964-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-09 | 1968-04-09 | 1968-10-09 | $7700.00 | Window Closed / Lapsed |