US3519909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable speed motor drive using a wound rotor of an induction motor mechanically connected to the armature of a d.c. motor,both electrically connected by a control system
Assignee: Westinghouse Electric Corp
•
Filing: 1967-10-23
•
Granted: 1970-07-07
•
Expires: 1987-10-23
Abstract
No abstract record available.
Inventors
- 👤 Gerald E Mathias
- 👤 Lee A Kilgore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:44
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/24
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2066508A
Cited
US2288338A
Cited
US2359145A
Cited
US3066250A
Cited
US2970249A
Cited
US3059159A
Cited
US3136937A
Cited
US3210629A
Cited
US3327189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |