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Patent US2543483A successfully refreshed from Google Patents.
US2543483A
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Magnetic recording apparatus
Assignee: ANN K BARRETT
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Filing: 1948-01-19
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Granted: 1951-02-27
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Expires: 1968-01-19
Abstract
No abstract record available.
Inventors
- 👤 Edward L Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:34
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/12; G01; G01D; G01D15/00; G01D15/12; G11B15/00; G11B15/18; G11B15/44; G11B15/60; G11B15/602; G11B23/04; G11B23/06; G11B5/00; G11B5/127; G11B5/1272; G11B5/187; G11B5/23; G11B5/48; G11B5/488; G11B5/4893; G11B5/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |