US2739251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cooled electric clutch-brake driving devices
Assignee: Singer Co
•
Filing: 1952-05-01
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Granted: 1956-03-20
•
Expires: 1972-05-01
Abstract
No abstract record available.
Inventors
- 👤 Ross D Ingalls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:39
CPC Classifications
H; H02; H02K; H02K7/00; H02K7/10; H02K7/112; F; F16; F16D; F16D67/00; F16D67/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191414022A
Cited
CH133020A
Cited
US2058572A
Cited
CH200568A
Cited
US2321126A
Cited
GB622441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |