Patent US2683774A successfully refreshed from Google Patents.
US2683774A
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US
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Electromagnetic transducer head
Assignee: IIT Research Institute
•
Filing: 1948-12-23
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Granted: 1954-07-13
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Expires: 1968-12-23
Abstract
No abstract record available.
Inventors
- 👤 Camras Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/10; G11B5/105; G11B5/265; G11B5/2651
Claims Analysis
Total Claims: 0
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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) | 1957-07-12 | 1958-01-11 | 1958-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-12 | 1962-01-11 | 1962-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-12 | 1966-01-11 | 1966-07-13 | $7700.00 | Window Closed / Lapsed |