US3843755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetor with check valve bypass
Assignee: Walbro Corp
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Filing: 1973-03-29
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Granted: 1974-10-22
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Expires: 1993-03-29
Abstract
Abstract A diaphragm-controlled carburetor having a main jet leading from a fuel chamber above the diaphragm to a mixing passage and including a unidirectional check valve allowing flow through a main jet passage from said chamber and a bypass passageway around said check valve for allowing flow of fuel from said main jet passage to said diaphragm to compensate for the inertial effect of an air intake silencer used on said carburetor.
Inventors
- 👤 C Tuckey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:10
CPC Classifications
F; F02; F02M; F02M17/00; F02M17/02; F02M17/04; F02M17/34; F02M37/00; F02M37/04; F02M37/046; Y; Y10; Y10S; Y10S261/00; Y10S261/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
In a carburetor having a diaphragm control fuel inlet valve leading to a diaphragm chamber in which there is a fuel chamber above the diaphragm from which fuel is fed to a mixing passage through a manually regulated orifice to a main jet passage and through supplemental jet passages for idling, that improvement Which comprises, in combination: a. a check valve independent of the diaphragm leading from said fuel chamber to said main jet passage for unidirectional flow from said chamber to said passage, and b. a means forming a bypass passageway independent of said manually regulated orifice and around said check valve to connect said fuel chamber to said main jet passage, said passageway being calibrated to allow fuel to return directly from said main jet passage to said fuel chamber when said check valve is closed.
Claim 2
Dependent Claim
138 words
In a carburetor having a diaphragm control fuel inlet valve leading to a diaphragm chamber in which there is a fuel chamber above the diaphragm from which fuel is fed to a mixing passage through a manually regulated orifice to a main jet passage and through supplemental jet passages for idling, that improvement Which comprises, in combination: a. a check valve independent of the diaphragm leading from said fuel chamber to said main jet passage for unidirectional flow from said chamber to said passage, and b. a means forming a bypass passageway independent of said manually regulated orifice and around said check valve to connect said fuel chamber to said main jet passage, said passageway being calibrated to allow fuel to return directly from said main jet passage to said fuel chamber when said check valve is closed.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |