US2772135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for magnetically recording video-frequency signals
Assignee: ACF Industries Inc
•
Filing: 1952-08-15
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Granted: 1956-11-27
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Expires: 1972-08-15
Abstract
No abstract record available.
Inventors
- 👤 Max G Hollabaugh
- 👤 Fred D Sher
- 👤 Kenneth R Wisner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:52
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/0007; G01; G01S; G01S1/00; G01S1/02; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/292; G01S7/2923; G01S7/2926; G11B5/00; G11B5/127; G11B5/187; G11B5/1871; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2351006A
Cited
US2612681A
Cited
US2540711A
Cited
US2618710A
Cited
US2617705A
Cited
US2536272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |