Patent JPS5848302A successfully refreshed from Google Patents.
US2839613A
Expired / Lapsed
US
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Magnetic transducer head
Assignee: MARCHANT RES Inc
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Filing: 1952-07-07
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Granted: 1958-06-17
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Expires: 1972-07-07
Abstract
No abstract record available.
Inventors
- 👤 George B Greene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:37
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/56; G11B5/10; G11B5/127; G11B5/147; G11B5/17; G11B5/187; G11B5/23
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2456767A
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US2612681A
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US2468601A
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US2564445A
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US2459299A
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US2523576A
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US2754568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |