Patent JPS60215868A successfully refreshed from Google Patents.
US2509780A
Expired / Lapsed
US
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Magnetic record reproducing system
Assignee: RCA Corp
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Filing: 1948-04-29
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Granted: 1950-05-30
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Expires: 1968-04-29
Abstract
No abstract record available.
Inventors
- 👤 Dorothy L O'dea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:19
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/33; G11B5/35
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |