US2924668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and reading apparatus
Assignee: TDK Corp
•
Filing: 1957-01-22
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Granted: 1960-02-09
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Expires: 1977-01-22
Abstract
No abstract record available.
Inventors
- 👤 Hoshino Yasushi
- 👤 Namikawa Mamoru
- 👤 Tochihara Shigezo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/022; G11B17/025; G11B17/0255
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2511892A
Cited
US2245286A
Cited
GB674570A
Cited
US2750449A
Cited
US2772328A
Cited
FR1107292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |