Patent US2939758A successfully refreshed from Google Patents.
US2939758A
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US
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Magnetic data recording apparatus
Assignee: Unisys Corp
•
Filing: 1953-11-20
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Granted: 1960-06-07
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Expires: 1973-11-20
Abstract
No abstract record available.
Inventors
- 👤 Loring P Crosman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:37
CPC Classifications
G; G06; G06K; G06K1/00; G06K1/12; G06K1/125
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2067183A
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US2359617A
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US2561476A
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US2511121A
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US2856256A
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US2784392A
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US2791310A
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US2751433A
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US2672395A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |