Patent US2420873A successfully refreshed from Google Patents.
US2420873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
"rectox" motor control system
Assignee: Westinghouse Electric Corp
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Filing: 1943-07-03
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Granted: 1947-05-20
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Expires: 1963-07-03
Abstract
No abstract record available.
Inventors
- 👤 William H Formhals
- 👤 Jr Scott H Hanville
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:49
CPC Classifications
H; H02; H02P; H02P3/00; H02P3/06; H02P3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US865819A
Cited
GB191943A
Cited
US1805160A
Cited
US1933231A
Cited
DE538908C
Cited
US1955334A
Cited
US2298188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-19 | 1950-11-18 | 1951-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-19 | 1954-11-18 | 1955-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-19 | 1958-11-18 | 1959-05-20 | $7700.00 | Window Closed / Lapsed |