US2671545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic fluid clutch
Assignee: Stewart Warner Corp
•
Filing: 1949-07-20
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Granted: 1954-03-09
•
Expires: 1969-07-20
Abstract
No abstract record available.
Inventors
- 👤 Petroff Merlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:27
CPC Classifications
F; F16; F16D; F16D37/00; F16D37/02; F16D2037/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
BE485591A
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US811654A
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US1862267A
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US1950810A
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US2437871A
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US2479989A
Cited
FR984127A
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US2557140A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |