Patent US2853986A successfully refreshed from Google Patents.
US2853986A
Expired / Lapsed
US
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Crankcase ventilation system
Assignee: Motors Liquidation Co
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Filing: 1955-10-07
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Granted: 1958-09-30
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Expires: 1975-10-07
Abstract
No abstract record available.
Inventors
- 👤 Adelbert E Kolbe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:03
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/0033; F01M13/02; F01M13/021; F01M13/022; F01M13/023; F01M13/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2056762A
Cited
US2359485A
Cited
US2346736A
Cited
US2423592A
Cited
US2592380A
Cited
US2646784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |