US3677239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-polluting exhaust system for internal combustion engines
Assignee: Individual
•
Filing: 1970-06-24
•
Granted: 1972-07-18
•
Expires: 1990-06-24
Abstract
Abstract Combustion products from the exhaust manifold of an internal combustion engine are recirculated through a filter to a fuel mixing carburetor supplying a fuel mixture to the intake manifold. A metered flow of oxygen under pressure is supplied to the careburetor during engine operation for recharging the exhaust gas being returned to the engine as part of the fuel mixture.
Inventors
- 👤 James L Elkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:59
CPC Classifications
F; F02; F02M; F02M25/00; F02M33/00; F02M33/02; F02M33/04
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
A system for preventing contamination of air by exhaust from an internal combustion engine having a fuel mixing device, a fuel intake manifold, an exhaust manifold and engine cooling means, comprising recirculating means interconnecting the exhaust manifold and the fuel mixing device for returning fuel exhaust gas from the engine to the fuel mixing device, and means for recharging the exhaust gas supplied to the fuel mixing device, said recharging means comprising a source of oxygen under pressure, metering means connecting the source to the fuel mixing device for supplying a restricted flow of oxygen thereto and engine operation responsive means connected to the metering means for cutting off said flow oxygen while the engine is in an inactive condition.
Claim 2
Independent Claim
120 words
A system for preventing contamination of air by exhaust from an internal combustion engine having a fuel mixing device, a fuel intake manifold, an exhaust manifold and engine cooling means, comprising recirculating means interconnecting the exhaust manifold and the fuel mixing device for returning fuel exhaust gas from the engine to the fuel mixing device, and means for recharging the exhaust gas supplied to the fuel mixing device, said recharging means comprising a source of oxygen under pressure, metering means connecting the source to the fuel mixing device for supplying a restricted flow of oxygen thereto and engine operation responsive means connected to the metering means for cutting off said flow oxygen while the engine is in an inactive condition.
Claim 3
Dependent Claim
17 words
The combination of claim 1 including valve means connected to said recirculating means for venting the same.
Claim 4
Dependent Claim
31 words
The combination of claim 2 including valve operating means connected to the intake manifold for closing the valve means during operation of the engine to prevent venting of the recirculating means.
Claim 5
Dependent Claim
17 words
The combination of claim 3 including means for cooling the exhaust gas passing through the recirculating means.
Claim 6
Dependent Claim
26 words
The combination of claim 4 including flow regulating means connected to the intake manifold for varying the flow rate of oxygen conducted through the metering means.
Claim 7
Dependent Claim
31 words
The combination of claim 5 wherein the fuel mixing device includes a carburetor to which the recharging means is connected and gas filtering means connecting the recirculating means to the carburetor.
Claim 8
Dependent Claim
26 words
The combination of claim 1 including flow regulating means connected to the intake manifold for varying the flow rate of oxygen conducted through the metering means.
Claim 9
Dependent Claim
31 words
The combination of claim 7 wherein the fuel mixing device includes a carburetor to which the recharging means is connected and gas filtering means connecting the recirculating means to the carburetor.
Claim 10
Dependent Claim
31 words
The combination of claim 1 wherein the fuel mixing device includes a carburetor to which the recharging means is connected and gas filtering means connEcting the recirculating means to the carburetor.
Claim 11
Independent Claim
125 words
A system for preventing contamination of air by exhaust from an internal combustion engine having a fuel mixing device to which fuel is fed, a fuel intake manifold, an exhaust manifold and engine cooling means, comprising recirculating means interconnecting the exhaust manifold and the fuel mixing device for returning substantially all fuel exhaust gas from the engine during operation to the fuel mixing device, means for recharging the exhaust gas entering the fuel mixing device independently of the supply of fuel thereto, valve means connected to said recirculating means for venting the same while the engine is inoperative, and valve operating means connected to the intake manifold for closing the valve means only during operation of the engine to prevent venting of the recirculating means.
Claim 12
Independent Claim
125 words
A system for preventing contamination of air by exhaust from an internal combustion engine having a fuel mixing device to which fuel is fed, a fuel intake manifold, an exhaust manifold and engine cooling means, comprising recirculating means interconnecting the exhaust manifold and the fuel mixing device for returning substantially all fuel exhaust gas from the engine during operation to the fuel mixing device, means for recharging the exhaust gas entering the fuel mixing device independently of the supply of fuel thereto, valve means connected to said recirculating means for venting the same while the engine is inoperative, and valve operating means connected to the intake manifold for closing the valve means only during operation of the engine to prevent venting of the recirculating means.
Claim 13
Independent Claim
94 words
A system for preventing contamination of air by exhaust from an internal combustion engine having a fuel mixing device to which fuel is fed, a fuel intake manifold, an exhaust manifold and engine cooling means, comprising recirculating means interconnecting the exhaust manifold and the fuel mixing device during operation to the fuel mixing device, means for recharging the exhaust gas entering the fuel mixing device independently of the supply of fuel thereto, and means for passing the exhaust gas in heat exchange relation to the engine cooling means while conducted through the recirculating means.
Claim 14
Independent Claim
94 words
A system for preventing contamination of air by exhaust from an internal combustion engine having a fuel mixing device to which fuel is fed, a fuel intake manifold, an exhaust manifold and engine cooling means, comprising recirculating means interconnecting the exhaust manifold and the fuel mixing device during operation to the fuel mixing device, means for recharging the exhaust gas entering the fuel mixing device independently of the supply of fuel thereto, and means for passing the exhaust gas in heat exchange relation to the engine cooling means while conducted through the recirculating means.
Claim 15
Dependent Claim
28 words
The combination of claim 11 including gas filtering means through which substantially all of the exhaust gas is conducted during operation of the engine into the mixing device.
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |