Patent US2713953A successfully refreshed from Google Patents.
US2565191A
Expired / Lapsed
US
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Eddy current shield in electromagnetic transducer head
Assignee: IIT Research Institute
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Filing: 1949-01-12
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Granted: 1951-08-21
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Expires: 1969-01-12
Abstract
No abstract record available.
Inventors
- 👤 Raymond E Zenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:40
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US823086A
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US1519098A
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FR669415A
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US2040103A
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US2114189A
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US2277305A
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US2431540A
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US2456767A
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US2459299A
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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) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |