US2657377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reproduction of signals from magnetic records
Assignee: AT&T Inc
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Filing: 1951-05-25
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Granted: 1953-10-27
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Expires: 1971-05-25
Abstract
No abstract record available.
Inventors
- 👤 Gray Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:38
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782; G; G01; G01R; G01R13/00; G01R13/04; G11; G11B; G11B11/00; G11B11/10; G11B11/115; G11B5/00; G11B5/48; G11B5/49; G11B5/4907; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S84/00; Y10S84/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-10-26 | 1957-04-27 | 1957-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-26 | 1961-04-27 | 1961-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-26 | 1965-04-27 | 1965-10-27 | $7700.00 | Window Closed / Lapsed |