US4632674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diesel fuel containing a tetrazole or triazole cetane improver
Assignee: ExxonMobil Chemical Patents Inc
•
Filing: 1985-12-27
•
Granted: 1986-12-30
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Expires: 2005-12-27
Abstract
Abstract There is disclosed a diesel fuel containing a cetane number improving additive such as 5-propyl-1,2,3,4-tetraazacyclopenta-2,4-diene.
Inventors
- 👤 David J. Martella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:11
CPC Classifications
C; C07; C07D; C07D257/00; C07D257/02; C07D257/04; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/232; F; F02; F02B; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
A liquid fuel adapted for use in a diesel engine containing a cetane number increasing amount of at least one fuel soluble additive compound represented by the structural formula: ##STR4## wherein X represents a member selected from the group consisting of --O--, and >NR', and wherein R and R' independently are selected from the group consisting of hydrogen, alkyl, cycloalkyl, aryl, hydroxy, amino, alkoxy, hydroxyalkyl, alkaryl, and aralkyl.
Claim 2
Dependent Claim
68 words
A liquid fuel adapted for use in a diesel engine containing a cetane number increasing amount of at least one fuel soluble additive compound represented by the structural formula: ##STR4## wherein X represents a member selected from the group consisting of --O--, and >NR', and wherein R and R' independently are selected from the group consisting of hydrogen, alkyl, cycloalkyl, aryl, hydroxy, amino, alkoxy, hydroxyalkyl, alkaryl, and aralkyl.
Claim 3
Dependent Claim
14 words
The fuel composition of claim 1 wherein the cetane number improving additive is 5-propyl-1,2,3,4-tetraazacyclopenta-2,4-diene.
Claim 4
Dependent Claim
14 words
The fuel composition of claim 1 wherein said fuel is a petroleum-derived distillate fuel.
Claim 5
Dependent Claim
31 words
The fuel composition of claim 1 wherein the cetane number improving additive is represented by structural formula I wherein X is >NH, and R is C 1 to C 10 alkyl.
Claim 6
Dependent Claim
78 words
A process for improving the cetane number of a liquid fuel adapted for use in a diesel engine which comprises admixing with said fuel a cetane number improving amount of at least one additive represented by the structural formula: ##STR5## wherein X represents a member selected from the group consisting of --O--, and >NR', and wherein R and R' independently are selected from the group consisting of hydrogen, alkyl, cycloalkyl, aryl, hydroxy, amino, alkoxy, hydroxyalkyl, alkaryl and aralkyl.
Claim 7
Dependent Claim
78 words
A process for improving the cetane number of a liquid fuel adapted for use in a diesel engine which comprises admixing with said fuel a cetane number improving amount of at least one additive represented by the structural formula: ##STR5## wherein X represents a member selected from the group consisting of --O--, and >NR', and wherein R and R' independently are selected from the group consisting of hydrogen, alkyl, cycloalkyl, aryl, hydroxy, amino, alkoxy, hydroxyalkyl, alkaryl and aralkyl.
Claim 8
Dependent Claim
10 words
The process of claim 5 wherein said additive is 5-propyl-1,2,3,4-tetraazacyclopenta-2,4-diene.
Claim 9
Dependent Claim
22 words
The process of claim 5 wherein in said structural formula X is >NH, and R is C 1 to C 10 alkyl.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |