Patent US2698875A successfully refreshed from Google Patents.
US2698875A
Expired / Lapsed
US
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Plural track magnetic recording and/or reproducing apparatus
Assignee: MAGNECORD Inc
•
Filing: 1950-03-24
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Granted: 1955-01-04
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Expires: 1970-03-24
Abstract
No abstract record available.
Inventors
- 👤 James H Greenwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:53
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/917; H04N5/919; G; G11; G11B; G11B5/00; G11B5/48; G11B5/49; G11B5/4907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1945626A
Cited
US1974911A
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US2213246A
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US2361752A
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US2479308A
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US2468601A
Cited
US2514578A
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US2517808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-03 | 1958-07-05 | 1959-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-03 | 1962-07-05 | 1963-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-03 | 1966-07-05 | 1967-01-04 | $7700.00 | Window Closed / Lapsed |