Patent US1943881A successfully refreshed from Google Patents.
US2844773A
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Induction motor control systems
Assignee: Singer Co
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Filing: 1957-04-02
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Granted: 1958-07-22
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Expires: 1977-04-02
Abstract
No abstract record available.
Inventors
- 👤 Edgar P Turner
- 👤 John A Herr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:41
CPC Classifications
D; D07; D07B; D07B7/00; D07B7/02; B; B65; B65H; B65H59/00; B65H59/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |