US2663833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic amplifier creeping speed control
Assignee: Westinghouse Electric Corp
•
Filing: 1950-04-15
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Granted: 1953-12-22
•
Expires: 1970-04-15
Abstract
No abstract record available.
Inventors
- 👤 Martin H Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:51
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB446790A
Cited
US2140349A
Cited
US2137068A
Cited
US2286370A
Cited
US2285654A
Cited
US2502098A
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 |