Patent US2509017A successfully refreshed from Google Patents.
US2509017A
Expired / Lapsed
US
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Magnetic recording apparatus
Assignee: General Electric Co
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Filing: 1945-03-21
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Granted: 1950-05-23
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Expires: 1965-03-21
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Sear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:47
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/05; G11B15/06; G11B15/10; G11B15/16; G11B15/18; G11B15/22; G11B23/00; G11B23/38; G11B23/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US909414A
Cited
US1939181A
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US1977697A
Cited
US1915113A
Cited
US2032176A
Cited
US2146869A
Cited
US2351005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |