US4769185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diaphragm carburetor for internal combustion engine
Assignee: Walbro Far East Inc
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Filing: 1987-08-13
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Granted: 1988-09-06
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Expires: 2007-08-13
Abstract
Abstract A diaphragm carburetor with a fuel metering chamber designed for easy restart when hot which includes a separate escape chamber connected to the metering chamber having a second diaphragm controlled exhaust valve. The second diaphragm is subject to positive crankcase pressure during engine operation to maintain the exhaust valve closed. When the engine is stopped, the exhaust valve is opened by a spring and fuel in the metering chamber will move into the escape chamber and out of the carburetor rather than be forced into the fuel mixing passage and venturi of the carburetor.
Inventors
- 👤 Kohji Nagasaka
- 👤 Yoshimi Sejimo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:17
CPC Classifications
F; F02; F02M; F02M17/00; F02M17/02; F02M17/04; F02M5/00; F02M5/10; Y; Y10; Y10S; Y10S261/00; Y10S261/68; Y10S261/81
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A diaphragm carburetor for an internal combustion engine comprising diaphragm means forming a fuel metering chamber, a fuel escape chamber in communication with said metering chamber, passage means communicating said escape chamber with the atmosphere, and spring-biased, diaphragm-operated valve means controlling flow through said passage means and operated in response to positive pressure generated by the engine to close said valve means during engine operation and to open said valve means when the engine is inoperative.
Claim 2
Dependent Claim
76 words
A diaphragm carburetor for an internal combustion engine comprising diaphragm means forming a fuel metering chamber, a fuel escape chamber in communication with said metering chamber, passage means communicating said escape chamber with the atmosphere, and spring-biased, diaphragm-operated valve means controlling flow through said passage means and operated in response to positive pressure generated by the engine to close said valve means during engine operation and to open said valve means when the engine is inoperative.
References Cited (Backward Citations)
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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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |