US2778637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Endless magnetic tape cartridge
Assignee: CHARLES I POULSEN
•
Filing: 1954-07-30
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Granted: 1957-01-22
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Expires: 1974-07-30
Abstract
No abstract record available.
Inventors
- 👤 George H Eash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:30
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/06; G11B23/07; B; B65; B65H; B65H20/00; B65H20/26; G11B15/00; G11B15/18; G11B15/1883; G11B15/1891; G11B15/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2032336A
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US2238719A
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US2248293A
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US2426838A
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US2499700A
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US2609457A
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US2681950A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-22 | 1960-07-23 | 1961-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-22 | 1964-07-23 | 1965-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-22 | 1968-07-23 | 1969-01-22 | $7700.00 | Window Closed / Lapsed |