US2563299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling and tone-control system for audio amplifiers
Assignee: Individual
•
Filing: 1947-10-28
•
Granted: 1951-08-07
•
Expires: 1967-10-28
Abstract
No abstract record available.
Inventors
- 👤 Jose W Acosta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:30
CPC Classifications
H; H01; H01G; H01G5/00; H01G5/04; H01G5/06; H03; H03G; H03G5/00; H03G5/02; H03G5/04; H03G5/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1591177A
Cited
US1951685A
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US1931596A
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US2181817A
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US2190430A
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US2233776A
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US2244023A
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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 |