Patent US2693508A successfully refreshed from Google Patents.
US2693508A
Expired / Lapsed
US
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Magnetic recording, reproducing or erasing head
Assignee: General Electric Co
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Filing: 1948-11-13
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Granted: 1954-11-02
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Expires: 1968-11-13
Abstract
No abstract record available.
Inventors
- 👤 Harold W Lord
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:10
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/17
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2418542A
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US2483398A
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US2479308A
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US2469444A
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US2523576A
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US2591070A
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US2539400A
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US2547297A
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US2536272A
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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) | 1957-11-01 | 1958-05-03 | 1958-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-01 | 1962-05-03 | 1962-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-01 | 1966-05-03 | 1966-11-02 | $7700.00 | Window Closed / Lapsed |