US3575386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for reducing internal combustion engine hydrocarbon emissions
Assignee: Ford Motor Co
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Filing: 1969-04-25
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Granted: 1971-04-20
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Expires: 1989-04-25
Abstract
Abstract A device for reducing the emission of unburned hydrocarbons from an internal combustion engine during periods of engine speed deceleration when combustion chamber and intake manifold pressures drop to such low values as to inhibit complete combustion. The low pressure or vacuum that occurs is relieved by directing an air-fuel mixture into the intake manifold whenever manifold pressure falls to a predetermined value. This mixture is formed in a secondary charge forming device that operates independently from the conventional engine carburetor.
Inventors
- 👤 William David Boyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:07
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/005; Y; Y10; Y10S; Y10S261/00; Y10S261/19
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
The device of claim 1, wherein the source of fuel interconnected with said first inlet means comprises a carburetor float bowl.
Claim 2
Dependent Claim
95 words
The device of claim 1, wherein said valve means comprises a valve member having a closed position blocking said outlet means and an open position, resilient means bearing on said member and exerting a force urging said member towards the closed position, and an impervious diaphragm connected to said member for movement therewith, one side of said diaphragm being exposed to atmospheric pressure and the other side of said diaphragm being exposed to the pressure in said manifold, the force of atmospheric pressure on said diaphragm acting against the force exerted by said resilient means.
Claim 3
Dependent Claim
39 words
The device of claim 3, further including adjustable means bearing on said resilient means to vary the force exerted by the latter and the predetermined pressure at which said valve member moves from the closed to the open position.
Claim 4
Dependent Claim
188 words
In combination with an internal combustion engine having at least one combustion chamber, primary charge forming means for mixing air and fuel to be burned in said combustion chamber, said primary charge-forming device being interconnected with said combustion chamber by first conduit means, secondary charge-forming means for mixing air and fuel to form a combustible mixture, said secondary charge-forming means being interconnected with said combustion chamber by second conduit means, valve means positioned in said second conduit means and having a normal closed position and an open position permitting the passage thereby of the air-fuel charge formed in the secondary charge-forming means, and valve control means connected to said valve means, said valve control means including a flexible diaphragm, one side of said diaphragm being in direct communication with the atmosphere, the other side of said atmosphere being in direct communication with the outlet means, spring means biasing said valve to a normally closed position and acting in opposition to the force exerted by the atmosphere pressure, said valve control means causing said valve to open upon the vacuum pressure within the outlet means reaching a predetermined magnitude.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |