US2677090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Step-by-step electric motor
Assignee: AC Cossor Ltd
•
Filing: 1950-09-11
•
Granted: 1954-04-27
•
Expires: 1970-09-11
Abstract
No abstract record available.
Inventors
- 👤 Fleming-Williams Bria Clifford
- 👤 Woodward Clement Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:52
CPC Classifications
H; H02; H02P; H02P8/00; H02K; H02K37/00; H02K37/02; H02K37/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |