Patent US4404950A successfully refreshed from Google Patents.
US4404950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive fuel saving system
Assignee: United States Department of the Air Force
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Filing: 1982-02-09
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Granted: 1983-09-20
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Expires: 2002-02-09
Abstract
Abstract An improved system for ventilating and utilizing crankcase vapors in an internal combustion engine uses an air pump for feeding air to both the first and second air flow circuits of the system such that air and crankcase vapors will be withdrawn from the engine crankcase to the first circuit and directed to the engine intake system, while air will be added to the crankcase from the second circuit. The air pump is connected to and driven by the engine such that feeding of air to the first and second circuits is regulated in direct proportion to the rpm of the engine.
Inventors
- 👤 Alfred C. Dallman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:48
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/02; F01M13/0033; F01M13/021; F01M13/022; F01M13/028; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
186 words
In a crankcase ventilating and vapor utilizing sytem for an internal combustion engine having a sealed crankcase and an air-fuel intake system, said system having a first air flow circuit for withdrawing crankcase vapors from said engine crankcase and directing the same into said engine intake system, a second air flow circuit for providing a flow of air into said engine crankcase, and a third air flow circuit for metering air into said engine intake system to provide compensation for the addition of said crankcase vapors into said intake system, the improvement in said crankcase ventilating and vapor utilizing system comprising: air pumping means connected to both said first and second circuits for feeding air to said first and second circuits such that air and crankcase vapors will be withdrawn from said crankcase to said first circuit and directed to said engine intake system, as air is added to said crankcase from said second circuit, whereby a continuous circulation of air through said crankcase and ventilation of vapors therefrom is achieved, accompanied by combustion of said vapors in said engine after introduction through its intake system.
Claim 2
Dependent Claim
186 words
In a crankcase ventilating and vapor utilizing sytem for an internal combustion engine having a sealed crankcase and an air-fuel intake system, said system having a first air flow circuit for withdrawing crankcase vapors from said engine crankcase and directing the same into said engine intake system, a second air flow circuit for providing a flow of air into said engine crankcase, and a third air flow circuit for metering air into said engine intake system to provide compensation for the addition of said crankcase vapors into said intake system, the improvement in said crankcase ventilating and vapor utilizing system comprising: air pumping means connected to both said first and second circuits for feeding air to said first and second circuits such that air and crankcase vapors will be withdrawn from said crankcase to said first circuit and directed to said engine intake system, as air is added to said crankcase from said second circuit, whereby a continuous circulation of air through said crankcase and ventilation of vapors therefrom is achieved, accompanied by combustion of said vapors in said engine after introduction through its intake system.
Claim 3
Dependent Claim
152 words
The crankcase ventilating and vapor utilizing system as recited in claim 1, wherein: said first circuit includes a first pipe being coupled at its opposite ends to said air pumping means and said intake system and intermediate its opposite ends to said crankcase, said first pipe providing a main air flow stream for withdrawing said crankcase vapors, said first circuit further including a second pipe being connected to said first pipe both upstream and downstream of said connection of said first pipe to said crankcase so as to provide an auxiliary air flow stream from and back to said main air flow stream; and said engine has an exhaust manifold with said second pipe being disposed in heat exchange relationship therewith for heating air and large heavy particulate matter in said auxiliary flow stream which further vaporizes said heavy particulate matter prior to introduction of said vapor into said engine intake system.
Claim 4
Dependent Claim
50 words
The crankcase ventilating and vapor utilizing system as recited in claims 1 or 2, wherein said air pumping means is connected to and driven by said engine such that the feeding of air to said first and second circuits is regulated in direct proportion to the rpm of said engine.
References Cited (Backward Citations)
US1286930A
Cited
US1299790A
Cited
US1950586A
Cited
US1981290A
Cited
US2271150A
Cited
US3246639A
Cited
US3473299A
Cited
US3545416A
Cited
US3630182A
Cited
US3990421A
Cited
US4279236A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |