US2640957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit for reversible d. c. motors
Assignee: Automatic Temperature Control Co Inc
•
Filing: 1950-04-18
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Granted: 1953-06-02
•
Expires: 1970-04-18
Abstract
No abstract record available.
Inventors
- 👤 William D Macgeorge
- 👤 Cross Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:38
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1967877A
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GB446848A
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US2175009A
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US2293502A
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US2333393A
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US2420539A
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US2432422A
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US2452609A
Cited
US2437140A
Cited
US2493575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |