US2901738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential interlock for servo system
Assignee: International Business Machines Corp
•
Filing: 1956-12-13
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Granted: 1959-08-25
•
Expires: 1976-12-13
Abstract
No abstract record available.
Inventors
- 👤 Dennis D Willard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:38
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/54; G11B5/55; G11B5/5521; G11B5/5526; G11B5/553; G11B5/5547
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2750553A
Cited
US2751274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |