Patent US2668059A successfully refreshed from Google Patents.
US2668059A
Expired / Lapsed
US
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Equipment for use with multitrack magnetic tape records
Assignee: Int Electronics Co
•
Filing: 1947-04-26
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Granted: 1954-02-02
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Expires: 1967-04-26
Abstract
No abstract record available.
Inventors
- 👤 Roberts Bruce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:26
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5504; G11B15/00; G11B15/02; G11B15/05; G11B15/06; G11B15/18; G11B15/26; G11B15/28; G11B15/29; G11B15/44; G11B15/442; G11B15/444; G11B15/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US788728A
Cited
US1223771A
Cited
DE327104C
Cited
US1466750A
Cited
GB172296A
Cited
DE390878C
Cited
US1852236A
Cited
US1789607A
Cited
GB392641A
Cited
GB459035A
Cited
US2132024A
Cited
US2215625A
Cited
GB544760A
Cited
US2408320A
Cited
US2418543A
Cited
US2430538A
Cited
US2464220A
Cited
US2500903A
Cited
US2468198A
Cited
US2523387A
Cited
US2419476A
Cited
US2535486A
Cited
US2536666A
Cited
US2509650A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |