Patent US2809309A successfully refreshed from Google Patents.
US2809309A
Expired / Lapsed
US
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Torque responsive brake system
Assignee: US Electrical Motors Inc
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Filing: 1954-05-10
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Granted: 1957-10-08
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Expires: 1974-05-10
Abstract
No abstract record available.
Inventors
- 👤 William M Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:32
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/10; H02K7/102; H02K7/1021; H02K7/1023; H02K7/1025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB133718A
Cited
US950224A
Cited
US2037735A
Cited
US2274356A
Cited
US2257611A
Cited
US2520204A
Cited
US2628321A
Cited
US2755396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |