Patent US2838244A successfully refreshed from Google Patents.
US2838244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscous drive for fan
Assignee: Eaton Corp
•
Filing: 1955-01-10
•
Granted: 1958-06-10
•
Expires: 1975-01-10
Abstract
No abstract record available.
Inventors
- 👤 Oldberg Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:05
CPC Classifications
F; F16; F16D; F16D3/00; F16D3/50; F16D3/72; F01; F01P; F01P7/00; F01P7/02; F01P7/04; F01P7/042; F16D35/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-09 | 1961-12-09 | 1962-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-09 | 1965-12-09 | 1966-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-09 | 1969-12-09 | 1970-06-10 | $7700.00 | Window Closed / Lapsed |