Patent US3742924A successfully refreshed from Google Patents.
US3742924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of air-fuel ratio
Assignee: TDY Industries LLC
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Filing: 1972-02-24
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Granted: 1973-07-03
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Expires: 1992-02-24
Abstract
Abstract A device for controlling the air-fuel ratio in an internal combustion engine wherein the rate of fuel flow from the float chamber to the air stream in the venturi of a carburetor is modified by a pressure modifying tube joining the float chamber and the venturi, a valve in said tube being responsive to the thermal conductivity of the exhaust gases in the exhaust pipe of the engine.
Inventors
- 👤 C Bachle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:49
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/10; F02M7/11; F02D; F02D9/00; F02D2700/00; F02D2700/09; Y; Y10; Y10S; Y10S261/00; Y10S261/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
In an internal combustion engine provided with an exhaust pipe for exhaust gases and provided with a carburetor comprising a venturi and a float chamber, the improvement which comprises: a. a pressure modifying tube joining said venturi with said float chamber, b. a valve in said pressure modifying tube and provided with a solenoid for controlling the opening and closing thereof, and c. a current generating, gas thermal conductivity sensor positioned in said exhaust pipe and electrically cooperative with said solenoid; wherein the position of said valve and consequently the ratio of air to fuel provided to said engine by said carburetor is responsive to the thermal conductivity of said exhaust gases.
Claim 2
Dependent Claim
112 words
In an internal combustion engine provided with an exhaust pipe for exhaust gases and provided with a carburetor comprising a venturi and a float chamber, the improvement which comprises: a. a pressure modifying tube joining said venturi with said float chamber, b. a valve in said pressure modifying tube and provided with a solenoid for controlling the opening and closing thereof, and c. a current generating, gas thermal conductivity sensor positioned in said exhaust pipe and electrically cooperative with said solenoid; wherein the position of said valve and consequently the ratio of air to fuel provided to said engine by said carburetor is responsive to the thermal conductivity of said exhaust gases.
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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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |