Patent US3022272A successfully refreshed from Google Patents.
US2650831A
Expired / Lapsed
US
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Record changing mechanism for phonographs
Assignee: Gerrard Engineering & Manufacturing Co Ltd
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Filing: 1947-08-28
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Granted: 1953-09-01
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Expires: 1967-08-28
Abstract
No abstract record available.
Inventors
- 👤 Fortune Henry James
- 👤 Mortimer Edmund Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:59
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1938810A
Cited
GB459155A
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US2378086A
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US2412441A
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US2295092A
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US2323472A
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US2435264A
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US2490678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |