Patent US5068548B1 successfully refreshed from Google Patents.
US4174231A
Expired / Lapsed
US
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Method for flushing the crankcase of an internal combustion engine
Assignee: Individual
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Filing: 1977-09-08
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Granted: 1979-11-13
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Expires: 1997-09-08
Abstract
Abstract A method of flushing the crankcase of an internal combustion engine includes the steps of draining the engine crankcase, removing the old filter and cartridge and replacing it with a fitting which consists of a hollow housing mountable on the oil filter mounting means of the engine. The crankcase is filled with flushing liquid and the engine is operated to effect circulation of the flushing fluid in the engine and through the fitting without filtration; the engine is then stopped and the crankcase drained, the fitting removed and replaced with a clean oil filter cartridge and the crankcase filled with clean oil.
Inventors
- 👤 Harold G. Hobgood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:26
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/04; F01; F01M; F01M11/00; F01M11/04; F01M11/0458
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A method of flushing with a liquid the crankcase of an internal combustion engine of the type having a spin-on oil filter cartridge fitting including an outflow opening, an inflow opening and a threaded pipe portion on which a spin-on oil filter cartridge is removably mounted, said method comprising the steps of draining the engine crankcase of any fluids contained therein, removing said spin-on filter cartridge, placing said flushing liquid in the crankcase, operating the engine to effect circulation of the flushing liquid in the engine to cause flow of the flushing liquid from said outflow opening and immediately returning said flushing liquid flowing from the outflow opening to the inflow opening of said engine without passing said flushing liquid through filtration means.
Claim 2
Independent Claim
123 words
A method of flushing with a liquid the crankcase of an internal combustion engine of the type having a spin-on oil filter cartridge fitting including an outflow opening, an inflow opening and a threaded pipe portion on which a spin-on oil filter cartridge is removably mounted, said method comprising the steps of draining the engine crankcase of any fluids contained therein, removing said spin-on filter cartridge, placing said flushing liquid in the crankcase, operating the engine to effect circulation of the flushing liquid in the engine to cause flow of the flushing liquid from said outflow opening and immediately returning said flushing liquid flowing from the outflow opening to the inflow opening of said engine without passing said flushing liquid through filtration means.
References Cited (Backward Citations)
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US3260367A
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US3282429A
Cited
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Cited
US3773180A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |