US2520732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound amplifier muting means
Assignee: Individual
•
Filing: 1945-09-26
•
Granted: 1950-08-29
•
Expires: 1965-09-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Eugene F Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:48
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/34; H03G3/348
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1937173A
Cited
US2166532A
Cited
US2197933A
Cited
US2265394A
Cited
US2346177A
Cited
US2389213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-28 | 1954-02-27 | 1954-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-28 | 1958-02-27 | 1958-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-28 | 1962-02-27 | 1962-08-29 | $7700.00 | Window Closed / Lapsed |