Patent US2902544A successfully refreshed from Google Patents.
US2902544A
Expired / Lapsed
US
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Tapered magnetic head
Assignee: Individual
•
Filing: 1953-06-17
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Granted: 1959-09-01
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Expires: 1973-06-17
Abstract
No abstract record available.
Inventors
- 👤 Leonard D Barry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:27
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB504932A
Cited
US2536810A
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US2469266A
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US2655561A
Cited
US2596912A
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US2535712A
Cited
GB683797A
Cited
US2822427A
Cited
US2806904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |