US2803988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronzied magnetic sound recording apparatus
Assignee: Individual
•
Filing: 1951-05-04
•
Granted: 1957-08-27
•
Expires: 1971-05-04
Abstract
No abstract record available.
Inventors
- 👤 Richard H Ranger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:36
CPC Classifications
G; G03; G03B; G03B31/00; G11; G11B; G11B5/00; G11B5/86
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR956447A
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US1210323A
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US1877731A
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US1950091A
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DE594991C
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GB478481A
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US2208404A
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US2272821A
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US2378611A
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US2503083A
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US2712572A
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US2475439A
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US2496047A
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US2679187A
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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) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |