US3650256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel evaporative control system
Assignee: American Motors Corp
•
Filing: 1970-08-14
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Granted: 1972-03-21
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Expires: 1990-08-14
Abstract
Abstract A system designed to prevent raw fuel vapors from entering the atmosphere from the carburetor fuel bowl and the fuel tank of a motor vehicle. The carburetor is internally vented and the fuel tank vent line routes the vapors from the tank through a float type liquid-vapor separating valve to the cylinder head cover of the engine. The vapors are stored in the crankcase of the engine while the engine is not operating and combusted during engine operation with the blow-by products by use of the positive crankcase ventilation system.
Inventors
- 👤 Charles J Marshall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:55
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/10; B; B60; B60K; B60K15/00; B60K15/03; B60K15/035; B60K15/03519; F; F02; F02M; F02M25/00; F02M25/08; F02M25/0836; F02M25/089; C08J2321/00; F02F; F02F7/00; F02F7/006; F02M2025/0863; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3084; Y10T137/309; Y10T137/3099
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A fuel evaporative control system for a vehicle comprising: a. a fuel tank having a filler neck; b. a filler cap closing said neck; c. a vent line connected to the upper portion of said fuel tank; d. fuel vapor storage means connected to said vent line; and e. a float type valve connected to said vent line intermediate said tank and storage means, said valve being normally open for the passage of fuel vapors therethrough to said storage means, said valve comprising: a housing, a float element located in said housing and being adapted to close said valve when moved by liquid fuel, and a vacuum valve located in said housing above said float element, said vacuum valve being adapted to relieve the vacuum when said float valve is closed.
Claim 2
Dependent Claim
131 words
A fuel evaporative control system for a vehicle comprising: a. a fuel tank having a filler neck; b. a filler cap closing said neck; c. a vent line connected to the upper portion of said fuel tank; d. fuel vapor storage means connected to said vent line; and e. a float type valve connected to said vent line intermediate said tank and storage means, said valve being normally open for the passage of fuel vapors therethrough to said storage means, said valve comprising: a housing, a float element located in said housing and being adapted to close said valve when moved by liquid fuel, and a vacuum valve located in said housing above said float element, said vacuum valve being adapted to relieve the vacuum when said float valve is closed.
Claim 3
Dependent Claim
17 words
The system of claim 1 in which said float type valve is located above said fuel tank.
Claim 4
Dependent Claim
18 words
The system of claim 2 in which said filler cap has pressure and vacuum relief means located therein.
Claim 5
Dependent Claim
36 words
The system of claim 3 further comprising an expansion tank having a plurality of orifices therein, said expansion tank being located in the upper portion of said fuel tank and in communication with said vent line.
Claim 6
Dependent Claim
32 words
The system of claim 1 in which said vacuum valve of said float valve is in communication with said vent line and therefore said storage means when said vacuum valve is open.
Claim 7
Dependent Claim
36 words
The system of claim 5 in which said float type valve has an annular wall surrounding said vacuum valve to form an air pocket thereabout in conjunction with liquid fuel to positively close said vacuum valve.
Claim 8
Dependent Claim
18 words
The system of claim 6 in which said fuel vapor storage means is the engine of the vehicle.
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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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |