Patent US2743320A successfully refreshed from Google Patents.
US2743320A
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US
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Variable area magnetic recording system
Assignee: Unisys Corp
•
Filing: 1949-12-13
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Granted: 1956-04-24
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Expires: 1969-12-13
Abstract
No abstract record available.
Inventors
- 👤 Howard L Daniels
- 👤 Sidney M Rubens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:43
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/488; G11B5/02; G11B5/027; G11B5/0275
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1971028A
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US2236373A
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US2447899A
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US2488717A
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US2469266A
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US2632061A
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US2559505A
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US2594414A
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US2530564A
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US2657932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |