US2629784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wide frequency-range magnetic recording and reproducing system
Assignee: Individual
•
Filing: 1945-01-17
•
Granted: 1953-02-24
•
Expires: 1965-01-17
Abstract
No abstract record available.
Inventors
- 👤 Fred B Daniels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:00
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1640881A
Cited
US1847860A
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US1764120A
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US1949840A
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US1886616A
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US2213246A
Cited
US2251300A
Cited
US2351003A
Cited
US2351011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-24 | 1956-08-25 | 1957-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-24 | 1960-08-25 | 1961-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-24 | 1964-08-25 | 1965-02-24 | $7700.00 | Window Closed / Lapsed |