US2530997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Starting control system for synchronous motors
Assignee: Westinghouse Electric Corp
•
Filing: 1947-05-28
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Granted: 1950-11-21
•
Expires: 1967-05-28
Abstract
No abstract record available.
Inventors
- 👤 Schaelehlin Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:02
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/46
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1870456A
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US1896093A
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US1896074A
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US2264863A
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US2249465A
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US2282955A
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US2407121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |