Patent US2918537A successfully refreshed from Google Patents.
US2918537A
Expired / Lapsed
US
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Apparatus for making duplicate magnetic records
Assignee: IIT Research Institute
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Filing: 1957-03-26
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Granted: 1959-12-22
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Expires: 1977-03-26
Abstract
No abstract record available.
Inventors
- 👤 Camras Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:18
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/86; G11B5/865
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR801698A
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US2230913A
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DE728719C
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US2483123A
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US2543483A
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US2546927A
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US2653189A
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US2738383A
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US2585932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-12-21 | 1963-06-22 | 1963-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-21 | 1967-06-22 | 1967-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-21 | 1971-06-22 | 1971-12-22 | $7700.00 | Window Closed / Lapsed |