Patent US3572659A successfully refreshed from Google Patents.
US3572659A
Expired / Lapsed
US
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Fuel tank vapor recovery control
Assignee: Ford Motor Co
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Filing: 1968-09-03
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Granted: 1971-03-30
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Expires: 1988-09-03
Abstract
Abstract Vapors from the gasoline tank of a motor vehicle are connected by a line to the engine intake manifold to be burned. The line contains a fuel-air mixing valve that is opened by fuel tank vapor pressure to add air in the correct proportion to the fuel vapors so that the overall air-fuel ratio in the engine is unaffected by the addition of more fuel. A vacuum override to shut the valve is provided to prevent excessive idle speed r.p.m. increase.
Inventors
- 👤 Kazimieras Kizlauskas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:33
CPC Classifications
B; B60; B60K; B60K15/00; B60K15/03; B60K15/035; B60K15/03504; F; F02; F02M; F02M25/00; F02M25/08; F02M25/0872
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
31 words
A control as in claim 1, including additional means connecting said vacuum to said valve to act thereon and above a predetermined vacuum level move said valve to an off position.
Claim 2
Dependent Claim
46 words
A control as in claim 1, including additional means connecting said vacuum to the opposite end of said valve to act thereon and above a predetermined vacuum level move said valve to an override position blocking the flow of air and vapor through said conduit means.
Claim 3
Dependent Claim
214 words
A fuel vapor emission control for use with an internal combustion engine having an intake manifold providing a variable source of vacuum, a carburetor having a fuel-air induction passage and a throttle valve rotatably mounted therein to control flow therethrough, a fuel reservoir having a fuel vapor area therein, said emission control comprising, conduit means connecting the fuel vapors to said intake manifold, a source of air, and fuel vapor-air propOrtioning valve means in said conduit means controlling the mixture of and flow of fuel vapor and air therethrough to said manifold, said valve means comprising a valve body slidably containing a spool valve movable to a plurality of positions and having a plurality of axially spaced interconnected lands, said valve body having an air inlet connected to said source of air and an outlet spaced therefrom, and a fuel vapor inlet and an outlet spaced therefrom, means joining said outlets, said valve in a first position connecting said inlets to their respective outlets and in the remaining of said plurality of positions blocking the connection between said inlets and outlets, means biasing said valve to a blocking position, and means connecting said fuel vapor to act on said valve and move the same to said first position above a predetermined vapor pressure level.
Claim 4
Dependent Claim
35 words
A control as in claim 4, including connecting means connecting said valve to said vacuum whereby said valve is acted upon and moved by said vacuum to a blocking position above a predetermined vacuum level.
Claim 5
Dependent Claim
27 words
A control as in claim 5, said connecting means connecting said valve to the vacuum in said induction passage at a point slightly below the throttle valve.
Claim 6
Dependent Claim
27 words
A control as in claim 6, including a plurality of flow restricting means proportioning the flow of air and fuel vapor to the respective valve body inlets.
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |