Patent US2965721A successfully refreshed from Google Patents.
US2965721A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for magnetically recording video-frequency signals including ambient fluidbearing means
Assignee: ACF Industries Inc
•
Filing: 1956-04-27
•
Granted: 1960-12-20
•
Expires: 1976-04-27
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
2026-11-05 19:00
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1990548A
Cited
US2360625A
Cited
US2536030A
Cited
US2618710A
Cited
US2617705A
Cited
US2683038A
Cited
US2787750A
Cited
US2612566A
Cited
US2680785A
Cited
US2708693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-20 | 1964-06-20 | 1964-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-20 | 1968-06-20 | 1968-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-20 | 1972-06-20 | 1972-12-20 | $7700.00 | Window Closed / Lapsed |