Patent US2586397A successfully refreshed from Google Patents.
US2586397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control system for alternating current motors
Assignee: General Radio Co
•
Filing: 1946-07-08
•
Granted: 1952-02-19
•
Expires: 1966-07-08
Abstract
No abstract record available.
Inventors
- 👤 William N Tuttle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:24
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/16; H02P25/32; H02P25/325
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1376453A
Cited
US1695035A
Cited
US1963246A
Cited
US1944756A
Cited
US2102911A
Cited
US2229448A
Cited
US2175009A
Cited
US2287459A
Cited
US2448256A
Cited
US2421632A
Cited
US2462751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-18 | 1955-08-20 | 1956-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-18 | 1959-08-20 | 1960-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-18 | 1963-08-20 | 1964-02-19 | $7700.00 | Window Closed / Lapsed |