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US3753443A Expired / Lapsed US ⏱️ 0.0 years remaining

Apparatus for removing fuel vapors from a fuel tank on a motor vehicle

Assignee: Toyota Motor Corp
•
Filing: 1972-05-08
•
Granted: 1973-08-21
•
Expires: 1992-05-08
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Abstract

Abstract An apparatus for removing fuel vapors from a fuel tank on a motor vehicle, comprising a plurality of upstanding expansion chambers having different volumetric capacities and separated from one another by dividing walls except for the upper end portions thereof in which they communicate with one another through a common chamber. The expansion chambers have at the lower ends thereof openings communicating respectively with the upper corner portions of the fuel tank, and the expansion chamber communicating with the corner of the fuel tank located closest to the apparatus is provided with an especially large volumetric capacity as compared with the other expansion chambers. The apparatus further includes a check valve installed in a path provided for communication between the apparatus and the canister, crank case, etc. of the vehicle for controlling the flow of vapors therebetween. The apparatus may be manufactured as a very compact unit, and yet, is capable of very effective vapor separation irrespective of the position of installation thereof relative to the fuel tank.

Inventors

  • 👤 Y Sorimachi
  • 👤 K Okamoto

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 09:45
CPC Classifications
B; B60; B60K; B60K15/00; B60K15/03; B60K15/035; B60K15/03504; F; F02; F02M; F02M25/00; F02M25/08; F02M25/089; F02M2025/0863; Y; Y10; Y10T; Y10T137/00; Y10T137/4673

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 147 words
An apparatus for removing fuel vapors from a fuel tank on a motor vehicle, comprising a plurality of upstanding expansion chambers separated by dividing walls, and a common chamber provided with a plurality of openings communicating with the upper end openings of said expansion chambers and another opening leading to the exterior of the apparatus, said expansion chambers being provided at the bottom thereof with openings communicating with the inner corners of said fuel tank, the total volumetric capacity of said expansion chambers being larger than that which is required to accommodate the maximum possible increase in the volume of the fuel in said fuel tank due to the temperature elevation thereof, and the expansion chamber communicating with the inner corner of said fuel tank located closest to the apparatus being designed with an especially large volumetric capacity as compared with those of the other expansion chambers.
Claim 2
Independent Claim 147 words
An apparatus for removing fuel vapors from a fuel tank on a motor vehicle, comprising a plurality of upstanding expansion chambers separated by dividing walls, and a common chamber provided with a plurality of openings communicating with the upper end openings of said expansion chambers and another opening leading to the exterior of the apparatus, said expansion chambers being provided at the bottom thereof with openings communicating with the inner corners of said fuel tank, the total volumetric capacity of said expansion chambers being larger than that which is required to accommodate the maximum possible increase in the volume of the fuel in said fuel tank due to the temperature elevation thereof, and the expansion chamber communicating with the inner corner of said fuel tank located closest to the apparatus being designed with an especially large volumetric capacity as compared with those of the other expansion chambers.
Claim 3
Dependent Claim 49 words
The invention as defined in claim 1, including a plurality of means for establishing communication between said openings provided at the bottom of said expansion chambers and said corners of said fuel tank, wherein said expansion chambers have approximately ten times as large a cross-sectional area as said means.
Claim 4
Dependent Claim 16 words
The invention as defined in claim 1, wherein the apparatus is manufactured of a synthetic resin.
Claim 5
Dependent Claim 41 words
The invention as defined in claim 1, including a check valve provided in a path extending from said opening of said common chamber leading to the exterior of the apparatus for controlling the pressure of the vapors in said fuel tank.
Claim 6
Dependent Claim 48 words
The check valve of claim 4 comprising a valve body composed of an upper casing and a lower casing, and a valve member of elastic material slidably mounted in said lower casing and adapted to establish a hermetically sealed contact with the bottom surface of said upper casing.
Claim 7
Dependent Claim 39 words
The valve member of claim 5 having a vertical port, a diaphragm provided to enclose the upper end of said port which is formed with an especially small thickness, and a slit cut in the center of said diaphragm.

References Cited (Backward Citations)

US1335093A Cited
US1329997A Cited
US1948401A Cited
US2969803A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-08-20 1977-02-19 1977-08-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-08-20 1981-02-19 1981-08-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-08-20 1985-02-19 1985-08-21 $7700.00 Window Closed / Lapsed

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