Patent US2437611A successfully refreshed from Google Patents.
US2437611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor speed controller
Assignee: Individual
•
Filing: 1943-12-04
•
Granted: 1948-03-09
•
Expires: 1963-12-04
Abstract
No abstract record available.
Inventors
- 👤 Morrison Montford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:47
CPC Classifications
H; H02; H02P; H02P11/00; H02P11/06; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/922
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US546191A
Cited
US620336A
Cited
US713010A
Cited
US687140A
Cited
US1408040A
Cited
US2059738A
Cited
US1976581A
Cited
US2047912A
Cited
GB431401A
Cited
US2217478A
Cited
US2395246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-09 | 1951-09-08 | 1952-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-09 | 1955-09-08 | 1956-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-09 | 1959-09-08 | 1960-03-09 | $7700.00 | Window Closed / Lapsed |