Patent US2908541A successfully refreshed from Google Patents.
US2908541A
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Magnetic recording apparatus
Assignee: Northrop Grumman Systems Corp
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Filing: 1955-09-19
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Granted: 1959-10-13
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Expires: 1975-09-19
Abstract
No abstract record available.
Inventors
- 👤 Sergei M Fomenko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:19
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/0287; G11B23/00; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035; Y; Y10; Y10S; Y10S84/00; Y10S84/29
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) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |