US2758905A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording apparatus
Assignee: University of California Berkeley
•
Filing: 1951-01-29
•
Granted: 1956-08-14
•
Expires: 1971-01-29
Abstract
No abstract record available.
Inventors
- 👤 Curtis Daniel Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:38
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74; G11B5/76; G11B5/004; G11B5/127; G11B5/1278
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2185300A
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US2089287A
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GB512766A
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US2229293A
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US2436829A
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US2431541A
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US2546850A
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US2501126A
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US2550803A
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US2540654A
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US2592652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-14 | 1960-02-13 | 1960-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-14 | 1964-02-13 | 1964-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-14 | 1968-02-13 | 1968-08-14 | $7700.00 | Window Closed / Lapsed |