Patent US2743320A successfully refreshed from Google Patents.
US2743320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable area magnetic recording system
Assignee: Unisys Corp
•
Filing: 1949-12-13
•
Granted: 1956-04-24
•
Expires: 1969-12-13
Abstract
No abstract record available.
Inventors
- 👤 Howard L Daniels
- 👤 Sidney M Rubens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/488; G11B5/02; G11B5/027; G11B5/0275
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US699630A
Cited
US1971028A
Cited
US2236373A
Cited
US2447899A
Cited
US2488717A
Cited
US2469266A
Cited
US2632061A
Cited
US2559505A
Cited
US2594414A
Cited
US2530564A
Cited
US2657932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |