US5389112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low emissions diesel fuel
Assignee: Chevron USA Inc
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Filing: 1993-08-13
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Granted: 1995-02-14
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Expires: 2013-08-13
Abstract
Abstract A low emissions diesel fuel with prescribed levels of aromatics and cetane number is disclosed which, when combusted in a diesel engine, results in lower emissions than the California Reference diesel fuel.
Inventors
- 👤 Manuch Nikanjam
- 👤 Richard F. Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:08
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/04; C10L1/08; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
In a Low Emissions Diesel Fuel, the improvement which comprises a Diesel Fuel having an Aromatics Content in the range of from 14.3 to 19.7 percent by weight and a Cetane Number in the range of from 53.4 to 60.8, said Cetane Number and Aromatics Content being within the tetragonal area defined by Points A, B, C and D shown in FIG. 1, wherein line A-B in FIG. 1 is expressed by the equation: Aromatics Content=0.976 (Cetane Number)-39.6 and line C-D in FIG. 1 is expressed by the equation: Aromatics Content=1.03 (Cetane Number)-40.7 whereby statistically determined emissions resulting from combusting said Low Emissions Diesel Fuel in a diesel engine are less than statistically determined emissions resulting from combustion of California Reference diesel fuel in said engine.
Claim 2
Dependent Claim
126 words
In a Low Emissions Diesel Fuel, the improvement which comprises a Diesel Fuel having an Aromatics Content in the range of from 14.3 to 19.7 percent by weight and a Cetane Number in the range of from 53.4 to 60.8, said Cetane Number and Aromatics Content being within the tetragonal area defined by Points A, B, C and D shown in FIG. 1, wherein line A-B in FIG. 1 is expressed by the equation: Aromatics Content=0.976 (Cetane Number)-39.6 and line C-D in FIG. 1 is expressed by the equation: Aromatics Content=1.03 (Cetane Number)-40.7 whereby statistically determined emissions resulting from combusting said Low Emissions Diesel Fuel in a diesel engine are less than statistically determined emissions resulting from combustion of California Reference diesel fuel in said engine.
Claim 3
Dependent Claim
34 words
The Low Emissions Diesel Fuel according to claim 1 wherein the Cetane Number and the Aromatics Content are within the tetragonal area defined by Points A, B, E and F shown in FIG. 2.
Claim 4
Dependent Claim
24 words
The Low Emissions Diesel Fuel according to claim 2 wherein the Cetane Number is 59 and the Aromatics Content is 19 percent by weight.
Claim 5
Dependent Claim
24 words
The Low Emissions Diesel Fuel according to claim 2 wherein the Cetane Number is 55 and the Aromatics Content is 15 percent by weight.
Claim 6
Dependent Claim
24 words
The Low Emissions Diesel Fuel according to claim 1 wherein the Cetane Number is 58 and the Aromatics Content is 19 percent by weight.
Claim 7
Dependent Claim
34 words
The Low Emissions Diesel Fuel according to claim 1 further comprising less than about 202 ppm sulfur, less than about 466 ppm nitrogen, and less than about 4.68 percent by weight polynuclear aromatic compounds.
Claim 8
Dependent Claim
27 words
The Low Emissions Diesel Fuel according to claim 1 further comprising from about 0.01 percent by weight to about 0.40 percent by weight of a cetane improver.
Claim 9
Dependent Claim
16 words
The Low Emissions Diesel Fuel according to claim 7 wherein the cetane improver is 2-ethyl-hexyl nitrate.
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) | 1998-02-13 | 1998-08-15 | 1999-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-13 | 2002-08-15 | 2003-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-13 | 2006-08-15 | 2007-02-14 | $7700.00 | Window Closed / Lapsed |