US2741439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape recorder
Assignee: WEBSTER CHICAGO CORP
•
Filing: 1951-10-29
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Granted: 1956-04-10
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Expires: 1971-10-29
Abstract
No abstract record available.
Inventors
- 👤 Colin B Dale
- 👤 Paul K Bridenbaugh
- 👤 Raymond C Bierman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:54
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/22; G11B15/02; G11B15/12; G11B15/16; G11B15/44; G11B15/442; G11B15/60; G11B15/62; Y; Y10; Y10S; Y10S242/00; Y10S242/912
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2535478A
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US2504587A
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US2467507A
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US2540299A
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US2542917A
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US2538893A
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US2555643A
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US2571807A
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US2620404A
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US2567158A
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US2542590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |