US2534423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Braking system for induction motors
Assignee: Cutler Hammer Inc
•
Filing: 1944-07-22
•
Granted: 1950-12-19
•
Expires: 1964-07-22
Abstract
No abstract record available.
Inventors
- 👤 John F H Douglas
- 👤 Pell Eric
- 👤 Edwin W Seeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:44
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/18; H02P3/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US862168A
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US1134197A
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US1539839A
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US1945392A
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US2141056A
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US2227467A
Cited
US2196402A
Cited
GB518476A
Cited
US2193642A
Cited
US2304604A
Cited
US2280991A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-18 | 1954-06-19 | 1954-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-18 | 1958-06-19 | 1958-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-18 | 1962-06-19 | 1962-12-19 | $7700.00 | Window Closed / Lapsed |