US2857164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recorder
Assignee: IIT Research Institute
•
Filing: 1951-08-01
•
Granted: 1958-10-21
•
Expires: 1971-08-01
Abstract
No abstract record available.
Inventors
- 👤 Camras Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:34
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE633160C
Cited
US2232486A
Cited
US2311383A
Cited
US2253724A
Cited
US2323215A
Cited
US2325563A
Cited
US2259631A
Cited
US2364556A
Cited
US2568681A
Cited
US2586666A
Cited
US2568734A
Cited
US2468198A
Cited
US2551198A
Cited
US2653819A
Cited
US2668059A
Cited
US2676022A
Cited
US2631034A
Cited
US2701718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |