US2542854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor control system
Assignee: English Electric Co Ltd
•
Filing: 1947-04-02
•
Granted: 1951-02-20
•
Expires: 1967-04-02
Abstract
No abstract record available.
Inventors
- 👤 Wilson Graham Rudge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:53
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/04; B65H23/18; B65H23/195; B65H23/1955; B65H23/198
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1812818A
Cited
US2165127A
Cited
US2246292A
Cited
US2246294A
Cited
US2306157A
Cited
US2284802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |