US2637560A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound reproducing device using endless recording tapes
Assignee: POWELL ANNOUNCER Corp
•
Filing: 1949-12-20
•
Granted: 1953-05-05
•
Expires: 1969-12-20
Abstract
No abstract record available.
Inventors
- 👤 Graham P Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:25
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2519597A
Cited
US2468198A
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US2490771A
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US2474972A
Cited
US2462687A
Cited
US2560234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |