US3535441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape tension control system for magnetic tape recorder
Assignee: WESTEL CO
•
Filing: 1967-12-29
•
Granted: 1970-10-20
•
Expires: 1987-12-29
Abstract
No abstract record available.
Inventors
- 👤 Alan G Grace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:52
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/43; H; H02; H02P; H02P5/00; H02P5/46; H02P5/52; H02P5/56
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3050594A
Cited
US3025344A
Cited
US3231668A
Cited
US3112052A
Cited
US3378646A
Cited
US3295032A
Cited
US3345457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |