US3854911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure fuel tank evaporation control
Assignee: Individual
•
Filing: 1971-04-13
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Granted: 1974-12-17
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Expires: 1991-04-13
Abstract
Abstract This invention pertains to a method of controlling the evaporation from a carburetor float bowl and from a pressurized fuel tank when the vapor pressure exceeds a predetermined level and a method of relieving the built up vapor pressure in the pressurized tank before removing the cap preparatory to filling the tank, and venting all such fumes to a vapor absorbing canister such as a canister containing activated carbon or an oil saturated crankcase and later when the engine is running to recycle the absorber and draw the fumes to the intake of the engine to burn them in the engine.
Inventors
- 👤 B Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:07
CPC Classifications
F; F02; F02M; F02M25/00; F02M25/08; F02M25/089
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
163 words
In a fuel system of an internal combustion engine for capturing the vapors normally escaping from a tank containing vaporizable fuel when the tank is opened, said tank having a filler neck extending upwardly from the upper end of the tank and open at its free end for entry of fuel to refill the tank, a cap for sealing the open end of the filler neck against the escape of vapor under pressure generated by the fuel in the tank, a container having means therein for absorbing said vapors when directed thereinto, means forming with a portion of the neck a passageway leading from the interior of the tank to the interior of the container. Manually movable valve means alternately movable, while the cap seals the filler neck opening, to block said passageway for permitting build-up of vapor pressure in the tank and for unblocking said passageway to release any vapor pressure in excess of atmospheric pressure from said tank to said container.
Claim 2
Dependent Claim
163 words
In a fuel system of an internal combustion engine for capturing the vapors normally escaping from a tank containing vaporizable fuel when the tank is opened, said tank having a filler neck extending upwardly from the upper end of the tank and open at its free end for entry of fuel to refill the tank, a cap for sealing the open end of the filler neck against the escape of vapor under pressure generated by the fuel in the tank, a container having means therein for absorbing said vapors when directed thereinto, means forming with a portion of the neck a passageway leading from the interior of the tank to the interior of the container. Manually movable valve means alternately movable, while the cap seals the filler neck opening, to block said passageway for permitting build-up of vapor pressure in the tank and for unblocking said passageway to release any vapor pressure in excess of atmospheric pressure from said tank to said container.
Claim 3
Dependent Claim
17 words
In a system according to claim 1 including means operated by the engine for purging said container.
Claim 4
Dependent Claim
42 words
In a system accordiNg to claim 1 wherein the means forming said passageway includes a flexible tube extending from said portion of the neck and the manually adjustable valve means comprises a removable clamp for collapsing the tube for blocking the passageway.
Claim 5
Dependent Claim
44 words
In a system according to claim 1 wherein the valve means is located within the neck portion for normally blocking said passageway, and means on the cap operatively associated with the valve means for operating it to unblock the passageway without unsealing the cap.
Claim 6
Dependent Claim
18 words
In a system according to claim 4 including means to purge the container by operation of said engine.
Claim 7
Dependent Claim
35 words
In a system according to claim 4 wherein the means on the cap is movable by a turning movement of the cap without breaking the seal to operate the valve means to unblock the passageway.
Claim 8
Dependent Claim
26 words
In a system according to claim 4 wherein the means on the cap is movably mounted thereon for operating the valve means to unblock the passageway.
References Cited (Backward Citations)
US2860656A
Cited
US3352294A
Cited
US3289711A
Cited
US3434621A
Cited
US3543484A
Cited
US3617034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |