US2925896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardened surfaces for magnetic fluid clutches
Assignee: Eaton Corp
•
Filing: 1954-11-08
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Granted: 1960-02-23
•
Expires: 1974-11-08
Abstract
No abstract record available.
Inventors
- 👤 Ralph L Jaeschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:56
CPC Classifications
F; F16; F16D; F16D37/00; F16D37/02; F16D2037/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733792A
Cited
US1519417A
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US2718157A
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US2631705A
Cited
FR1045030A
Cited
US2809731A
Cited
GB739588A
Cited
US2851136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-22 | 1963-08-24 | 1964-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-22 | 1967-08-24 | 1968-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-22 | 1971-08-24 | 1972-02-23 | $7700.00 | Window Closed / Lapsed |