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US2521884A
Expired / Lapsed
US
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Automatic clutch
Assignee: SALSBURY CORP
•
Filing: 1947-12-05
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Granted: 1950-09-12
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Expires: 1967-12-05
Abstract
No abstract record available.
Inventors
- 👤 Lewis D Thostenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:21
CPC Classifications
F; F16; F16D; F16D43/00; F16D43/02; F16D43/04; F16D43/06; F16D43/08; F16D43/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US729197A
Cited
US1766227A
Cited
US2104074A
Cited
US2155351A
Cited
US2180217A
Cited
US2331976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |