US2901734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape drive and recording apparatus
Assignee: Unisys Corp
•
Filing: 1955-04-06
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Granted: 1959-08-25
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Expires: 1975-04-06
Abstract
No abstract record available.
Inventors
- 👤 Welsh Herbert Frazer
- 👤 Edmund D Schreiner
- 👤 Mock Leon Robert
- 👤 Jr John Presper Eckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:14
CPC Classifications
G; G06; G06K; G06K13/00; G06K13/18; G06K13/26; G06K13/28; G11; G11B; G11B15/00; G11B15/02; G11B15/026; G11B15/18; G11B15/22; G11B15/43; G11B15/56; H; H04; H04L; H04L13/00; H04L13/02; H04L13/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2131322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |