US2921657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic powder clutch with variable gap
Assignee: Eaton Corp
•
Filing: 1955-01-27
•
Granted: 1960-01-19
•
Expires: 1975-01-27
Abstract
No abstract record available.
Inventors
- 👤 Martin P Winther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:06
CPC Classifications
F; F16; F16D; F16D37/00; F16D37/02; F16D2037/002; F16D2037/004
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1137804A
Cited
US2575360A
Cited
US2690241A
Cited
US2629471A
Cited
US2693261A
Cited
US2772762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |