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Patent US2789673A successfully refreshed from Google Patents.
US2789673A
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Directional drive control for selfstarting synchronous motor
Assignee: E INGRAHAM Co
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Filing: 1954-05-26
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Granted: 1957-04-23
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Expires: 1974-05-26
Abstract
No abstract record available.
Inventors
- 👤 Roland G Tetro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:35
CPC Classifications
F; F16; F16H; F16H31/00; G; G04; G04C; G04C15/00; G04C15/0009; G04C15/0045; G05; G05G; G05G5/00; G05G5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |