US2769931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic amplifier control device for an electromagnetic clutch
Assignee: Singer Co
•
Filing: 1955-03-16
•
Granted: 1956-11-06
•
Expires: 1975-03-16
Abstract
No abstract record available.
Inventors
- 👤 George W Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:26
CPC Classifications
H; H02; H02P; H02P29/00; H02P29/0016; H02P29/0027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US347642A
Cited
US1806351A
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US1920814A
Cited
US2286777A
Cited
US2653290A
Cited
US2449779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |