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US4647292A
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Gasoline composition containing acid anhydrides
Assignee: Union Oil Company of California
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Filing: 1985-04-29
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Granted: 1987-03-03
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Expires: 2005-04-29
Abstract
Abstract A fuel composition containing an acid anhydride as an anti-knock additive.
Inventors
- 👤 Peter J. Jessup
- 👤 Stephen G. Brass
- 👤 Michael C. Croudace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:06
CPC Classifications
C; C10; C10L; C10L10/00; C10L10/10; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/188
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
40 words
A composition comprising a major amount of a liquid hydrocarbon base fuel and an anti-knock enhancing amount of a compound selected from the group consisting of pivalic anhydride and acetic anhydride and said composition is essentially free of organo-lead compounds.
Claim 2
Dependent Claim
40 words
A composition comprising a major amount of a liquid hydrocarbon base fuel and an anti-knock enhancing amount of a compound selected from the group consisting of pivalic anhydride and acetic anhydride and said composition is essentially free of organo-lead compounds.
Claim 3
Dependent Claim
22 words
The composition of claims 1, wherein the compound comprises from about 5 volume percent to about 10 volume percent of said composition.
Claim 4
Dependent Claim
11 words
The composition of claim 2 wherein said base fuel is gasoline.
Claim 5
Dependent Claim
16 words
The composition of claim 1 or 2 wherein said composition is essentially free or organo-manganese compounds.
Claim 6
Dependent Claim
12 words
The composition of claim 2 wherein said composition is free of alcohol.
Claim 7
Dependent Claim
35 words
A composition comprising: gasoline; and an anti-knock enhancing amount of a compound selected from the group consisting of pivalic anhydride and acetic anhydride, and wherein said composition is essentially free or organo-lead and organo-manganese compounds.
Claim 8
Dependent Claim
35 words
A composition comprising: gasoline; and an anti-knock enhancing amount of a compound selected from the group consisting of pivalic anhydride and acetic anhydride, and wherein said composition is essentially free or organo-lead and organo-manganese compounds.
Claim 9
Dependent Claim
28 words
A composition comprising a liquid hydrocarbon base fuel and between about 1 and 50 volume percent of pivalic anhydride and said composition is essentially free of organo-lead compounds.
Claim 10
Dependent Claim
28 words
A composition comprising a liquid hydrocarbon base fuel and between about 1 and 50 volume percent of pivalic anhydride and said composition is essentially free of organo-lead compounds.
Claim 11
Dependent Claim
23 words
A composition as defined in claim 7 wherein said pivalic anhydride is present in a proportion between about 1 and 15 volume percent.
Claim 12
Dependent Claim
23 words
A composition as defined in claim 7 wherein said pivalic anhydride is present in a proportion between about 5 and 15 volume percent.
Claim 13
Dependent Claim
15 words
A composition as defined in claim 8, or 9 wherein said base fuel is gasoline.
Claim 14
Dependent Claim
19 words
A composition as defined in claim 5, 7, or 9 wherein said composition is essentially free of organo-manganese compounds.
Claim 15
Dependent Claim
19 words
A composition as defined in claim 1, 6, 7, or 9 wherein said composition is essentially free of alcohol.
Claim 16
Dependent Claim
16 words
A composition as defined in claim 1, 2, or 5 wherein said compound is acetic anhydride.
Claim 17
Dependent Claim
15 words
A composition as defined in claim 1 or 5 wherein said compound is pivalic anhydride.
Claim 18
Dependent Claim
13 words
A composition as defined in claim 13 wherein said base fuel is gasoline.
Claim 19
Dependent Claim
21 words
A composition as defined in claim 15 wherein said base fuel is essentially free or organo-manganese compounds and free of alcohol.
Claim 20
Dependent Claim
17 words
A composition as defined in claim 14 wherein the base fuel is essentially free of organo-manganese compounds.
Claim 21
Dependent Claim
32 words
In a process for operating an internal combustion engine, the improvement comprising using as the fuel for said engine the composition defined in claim 1, 2, 5, 6, 7, 8 or 9.
Claim 22
Dependent Claim
25 words
In a process for operating an internal combustion engine, the improvement comprising using as the fuel for said engine the composition defined in claim 13.
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) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |