Patent US3419686A successfully refreshed from Google Patents.
US3419686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-track bi-directional tape recorder with uni-directional actuated traversing transducers
Assignee: V M Corp
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Filing: 1964-05-28
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Granted: 1968-12-31
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Expires: 1984-05-28
Abstract
No abstract record available.
Inventors
- 👤 Robert B Rhoades
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:16
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5504; G11B15/00; G11B15/02; G11B15/16; G11B15/18; G11B15/26; G11B15/28; G11B15/29; G11B15/44; G11B15/442
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2430538A
Cited
US2468198A
Cited
US2513423A
Cited
US2668059A
Cited
US2857164A
Cited
US2933319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-31 | 1972-07-01 | 1972-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-31 | 1976-07-01 | 1976-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-31 | 1980-07-01 | 1980-12-31 | $7700.00 | Window Closed / Lapsed |