US2660699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable voltage drive
Assignee: Westinghouse Electric Corp
•
Filing: 1950-03-23
•
Granted: 1953-11-24
•
Expires: 1970-03-23
Abstract
No abstract record available.
Inventors
- 👤 Helot Albert Rene Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:27
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/34; H02P7/347
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1060208A
Cited
US2220644A
Cited
US2308993A
Cited
US2323741A
Cited
US2431252A
Cited
US2486295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |