US2662120A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic head
Assignee: AT&T Inc
•
Filing: 1950-02-18
•
Granted: 1953-12-08
•
Expires: 1970-02-18
Abstract
No abstract record available.
Inventors
- 👤 John R Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:36
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/10; G11B5/147; G11B5/17
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2144844A
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US2263485A
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US2361752A
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US2479125A
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US2381463A
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US2483123A
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US2469444A
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US2493742A
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US2535480A
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US2456767A
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US2459299A
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US2555110A
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US2587097A
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US2517808A
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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) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |