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Patent US1537578A successfully refreshed from Google Patents.
US1537578A
Expired / Lapsed
US
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Motor-control system
Assignee: Westinghouse Electric Corp
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Filing: 1920-09-24
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Granted: 1925-05-12
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Expires: 1940-09-24
Abstract
No abstract record available.
Inventors
- 👤 Edgar M Bouton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:40
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/20
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) | 1928-05-11 | 1928-11-10 | 1929-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1932-05-11 | 1932-11-10 | 1933-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1936-05-11 | 1936-11-10 | 1937-05-12 | $7700.00 | Window Closed / Lapsed |