US2747027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording apparatus and method for making duplicate magnetic records
Assignee: IIT Research Institute
•
Filing: 1948-11-05
•
Granted: 1956-05-22
•
Expires: 1968-11-05
Abstract
No abstract record available.
Inventors
- 👤 Camras Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:25
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/86; G11B5/865
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US873541A
Cited
US768541A
Cited
US873042A
Cited
GB172296A
Cited
US1588706A
Cited
FR605132A
Cited
US1847860A
Cited
US1949840A
Cited
US1828190A
Cited
US2230913A
Cited
GB512766A
Cited
US2327956A
Cited
FR880559A
Cited
US2351007A
Cited
US2426838A
Cited
US2411849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |