Patent US2546927A successfully refreshed from Google Patents.
US2546927A
Expired / Lapsed
US
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Polarizing head for magnetic recorders
Assignee: Indiana Steel Products Co
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Filing: 1947-09-13
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Granted: 1951-03-27
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Expires: 1967-09-13
Abstract
No abstract record available.
Inventors
- 👤 Hugh A Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/027; G11B5/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1645139A
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US1773082A
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US1674539A
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US1997193A
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US2241105A
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US2307205A
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US2269149A
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US2388683A
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US2350083A
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US2380560A
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US2428449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-26 | 1954-09-25 | 1955-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-26 | 1958-09-25 | 1959-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-26 | 1962-09-25 | 1963-03-27 | $7700.00 | Window Closed / Lapsed |