US3650255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for reducing oxides of nitrogen and other pollutants from internal combustion engines
Assignee: Individual
•
Filing: 1969-09-17
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Granted: 1972-03-21
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Expires: 1989-09-17
Abstract
Abstract Oxides of nitrogen (NOx) in the exhaust gas emissions of an internal combustion engine are reduced, as measured on a standard 7-mode driving cycle, by utilizing natural gas as a fuel and operating with an equivalence ratio from about 1.25 to about 1.35. The 1.25 value corresponds to the maximum permissible amounts of NOx as measured in parts per million. The 1.35 value corresponds to the value where unacceptable power loss would result if exceeded. A gas-air mixer having a metering pin modified to operate with a natural gas inlet pressure of from 0.5 inches of H2O to +0.5 inches of H2O and within the specified range of equivalence ratios is employed. A modulator produces a fuel-rich condition at full throttle to increase power.
Inventors
- 👤 Robert W Mcjones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:23
CPC Classifications
F; F02; F02M; F02M21/00; F02M21/02; F02M21/04; F02D; F02D19/00; F02D19/02; F02D19/021; F02D19/023; F02D19/06; F02D19/0639; F02D19/0642; F02D19/0647; F02M13/00; F02M13/08; F02M21/0218; F02M21/023; F02M21/0239; F02B; F02B43/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
38 words
The method claimed in claim 1 including the additional step of changing the equivalence ratio at full throttle of the internal combustion engine from within the specified range to a fuel richer value of at least about stoichiometric.
Claim 2
Dependent Claim
13 words
The method claimed in claim 1 wherein the gaseous fuel is natural gas.
Claim 3
Dependent Claim
12 words
The method claimed in claim 1 wherein the gaseous fuel is methane.
Claim 4
Dependent Claim
38 words
The method claimed in claim 1 including the additional step of regulating the pressure of the gaseous fuel before the mixing step to a pressure of from about -0.5 inches of H2O to about +0.5 inches of H2O.
Claim 5
Dependent Claim
38 words
The method claimed in claim 2 including the additional step of regulating the pressure of the gaseous fuel before the mixing step to a pressure of from about -0.5 inches of H2O to about +0.5 inches of H2O.
Claim 6
Dependent Claim
17 words
The method claimed in claim 1 wherein the mixing step produces an equivalence ratio of about 1.3.
Claim 7
Independent Claim
117 words
A system for reducing the amount of NOx in the exhaust gas emissions of an internal combustion engine comprising: a. gaseous fuel regulator means for receiving a gaseous fuel from a source thereof and for delivering gaseous fuel within a predetermined pressure range; b. a fuel-air mixer in gaseous fuel communication with the regulator means to receive gaseous fuel at pressures within the predetermined pressure range, the fuel-air mixer being operable to mix gaseous fuel from the regulator means with air; and c. the regulator means and the fuel-air mixer being operable to produce a gaseous fuel-air mixture for introduction into the internal combustion engine within an equivalence ratio range of from about 1.25 to about 1.35.
Claim 8
Dependent Claim
31 words
The system claimed in claim 8 including means for changing the equivalence ratio at full power of the internal combustion engine to a fuel richer value of at least about stoichiometric.
Claim 9
Dependent Claim
36 words
The system claimed in claim 8 wherein the gaseous fuel regulator means is operable to deliver gaseous fuel within a predetermined pressure range of from about -0.5 inches of H2O to about +0.5 inches of H2O.
Claim 10
Dependent Claim
31 words
The system claimed in claim 9 including means for changing the equivalence ratio at full power of the internal combustion engine to a fuel richer value of at least about stoichiometric.
Claim 11
Dependent Claim
30 words
The system claimed in claim 8 wherein the means for obtaining a gaseous fuel-air mixture is operable to produce a gaseous fuel-air mixture with an equivalence ratio of about 1.3.
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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |