US2663835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traction-motor control
Assignee: Westinghouse Electric Corp
•
Filing: 1951-03-30
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Granted: 1953-12-22
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Expires: 1971-03-30
Abstract
No abstract record available.
Inventors
- 👤 Norman H Willby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:32
CPC Classifications
B; B60; B60L; B60L9/00; B60L9/02; B60L9/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1126163A
Cited
US1662243A
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US1703487A
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US1871697A
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US2073382A
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US2561782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |