US2648589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recorder
Assignee: AT&T Inc
•
Filing: 1949-07-19
•
Granted: 1953-08-11
•
Expires: 1969-07-19
Abstract
No abstract record available.
Inventors
- 👤 Clarence N Hickman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:13
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/64; G; G11; G11B; G11B21/00; G11B21/02; H04L; H04L17/00; H04L17/16; H04L17/20; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1325574A
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US1590399A
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GB205895A
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US1635324A
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US1833339A
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US1920969A
Cited
US2127331A
Cited
US2209720A
Cited
US2539837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-10 | 1957-02-09 | 1957-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-10 | 1961-02-09 | 1961-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-10 | 1965-02-09 | 1965-08-11 | $7700.00 | Window Closed / Lapsed |