Patent US2144575A successfully refreshed from Google Patents.
US2144575A
Expired / Lapsed
US
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Electric motor control
Assignee: Individual
•
Filing: 1938-08-20
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Granted: 1939-01-17
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Expires: 1958-08-20
Abstract
No abstract record available.
Inventors
- 👤 Murphy Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:26
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02P25/12; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/20; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/924; Y10S388/928
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-01-16 | 1942-07-18 | 1943-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-01-16 | 1946-07-18 | 1947-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-01-16 | 1950-07-18 | 1951-01-17 | $7700.00 | Window Closed / Lapsed |