Patent US2897286A successfully refreshed from Google Patents.
US2897286A
Expired / Lapsed
US
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Variable area magnetic recording apparatus
Assignee: Individual
•
Filing: 1954-06-29
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Granted: 1959-07-28
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Expires: 1974-06-29
Abstract
No abstract record available.
Inventors
- 👤 Ralph B Atkinson
- 👤 Steven G Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:46
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/04; G11; G11B; G11B5/00; G11B5/02; G11B5/027; G11B5/0275; G11B5/48; G11B5/49; G11B5/4907; G11B9/00
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) | 1962-07-27 | 1963-01-26 | 1963-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-07-27 | 1967-01-26 | 1967-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-07-27 | 1971-01-26 | 1971-07-28 | $7700.00 | Window Closed / Lapsed |