US2437140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic motor control circuits
Assignee: HPM Development Corp
•
Filing: 1943-10-20
•
Granted: 1948-03-02
•
Expires: 1963-10-20
Abstract
No abstract record available.
Inventors
- 👤 George A Waldie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:15
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/282; H02P7/285; H02P7/292; H02P7/293
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2264333A
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US2276752A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-02 | 1951-09-01 | 1952-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-02 | 1955-09-01 | 1956-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-02 | 1959-09-01 | 1960-03-02 | $7700.00 | Window Closed / Lapsed |