Patent US2456573A successfully refreshed from Google Patents.
US2456573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical motor control system
Assignee: EMI Ltd
•
Filing: 1945-12-21
•
Granted: 1948-12-14
•
Expires: 1965-12-21
Abstract
No abstract record available.
Inventors
- 👤 White Eric Lawrence Casling
- 👤 Harker Maurice Geoffrey
- 👤 Houchin John Philip Wynn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:43
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/913
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) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |