Patent US2813686A successfully refreshed from Google Patents.
US2813686A
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US
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Magnetic recording apparatus
Assignee: Individual
•
Filing: 1952-05-08
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Granted: 1957-11-19
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Expires: 1972-05-08
Abstract
No abstract record available.
Inventors
- 👤 Schroter Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:07
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/36; G11B15/00; G11B15/02; G11B15/10; G11B15/18; G11B15/1883; G11B15/20; G11B15/24; G11B15/675; G11B15/67563; G11B15/67573
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2504587A
Cited
US2536666A
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US2668674A
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US2555643A
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US2589660A
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US2617890A
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US2645495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |