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US2645494A
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US
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Magnetic sound recorder
Assignee: Rheinmetall Air Defence AG
•
Filing: 1949-09-27
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Granted: 1953-07-14
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Expires: 1969-09-27
Abstract
No abstract record available.
Inventors
- 👤 Keller Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:43
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/004
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2013832A
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US2043884A
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US2167417A
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US2258106A
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US2356999A
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US2375603A
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US2447473A
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US2535480A
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US2530029A
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US2496047A
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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) | 1956-07-13 | 1957-01-12 | 1957-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-13 | 1961-01-12 | 1961-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-13 | 1965-01-12 | 1965-07-14 | $7700.00 | Window Closed / Lapsed |