US2913657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor control for load tap changers
Assignee: Westinghouse Electric Corp
•
Filing: 1957-06-14
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Granted: 1959-11-17
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Expires: 1977-06-14
Abstract
No abstract record available.
Inventors
- 👤 Wendell L Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:10
CPC Classifications
H; H02; H02H; H02H11/00; H02H11/006; H02H11/007; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/14; G05F1/16; G05F1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2752556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-16 | 1963-05-18 | 1963-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-16 | 1967-05-18 | 1967-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-16 | 1971-05-18 | 1971-11-17 | $7700.00 | Window Closed / Lapsed |