Patent US3396909A successfully refreshed from Google Patents.
US3396909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling fan for internal-combustion engine having thermostatically operated clutch
Assignee: Individual
•
Filing: 1966-12-07
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Granted: 1968-08-13
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Expires: 1986-12-07
Abstract
No abstract record available.
Inventors
- 👤 Gerd W Seifert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:36
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/02; F01P7/08; F01P7/081; F01P7/082; F01P7/087; F16; F16D; F16D43/00; F16D43/02; F16D43/25
Claims Analysis
Total Claims: 0
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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) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |