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US3476873A
Expired / Lapsed
US
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Method of and apparatus for reproducing signals recorded on magnetic tape with head switching means
Assignee: ALLEN ELECTRONICS Inc
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Filing: 1965-12-22
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Granted: 1969-11-04
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Expires: 1985-12-22
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Boice
- 👤 Joseph Stevens Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:55
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/12; G11B15/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2996576A
Cited
US3109989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-03 | 1973-05-05 | 1973-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-03 | 1977-05-05 | 1977-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-03 | 1981-05-05 | 1981-11-04 | $7700.00 | Window Closed / Lapsed |