Patent US4113442A successfully refreshed from Google Patents.
US4113442A
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Middle distillate fuel compositions
Assignee: Shell USA Inc
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Filing: 1977-03-21
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Granted: 1978-09-12
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Expires: 1997-03-21
Abstract
Abstract Middle distillate compositions are disclosed which contain a filterability improver which may be considered to be a mono- or polyester of a specified C 10-40 hydrocarbyl alcohol and a hydroxy-carboxylic acid and, in some cases, a pour point depressant.
Inventors
- 👤 Siebe Hoff
- 👤 Gerhardus Ockers
- 👤 Arnold A. Buitelaar
- 👤 Eduard J. van de Kraats
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:53
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/19; C10L1/143; C10L1/1905
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
63 words
A middle distillate fuel composition of improved filterability, comprising a middle distillate fuel and, as filterability improver, from 50 to 800 parts per million, based on said fuel composition, of a C 10 -C 40 hydrocarbyl ester of a hydroxy-alkyl carboxylic acid in which the C 10 -C 40 hydrocarbyl group includes at least one uninterrupted chain of at least 8 methylene groups.
Claim 2
Dependent Claim
63 words
A middle distillate fuel composition of improved filterability, comprising a middle distillate fuel and, as filterability improver, from 50 to 800 parts per million, based on said fuel composition, of a C 10 -C 40 hydrocarbyl ester of a hydroxy-alkyl carboxylic acid in which the C 10 -C 40 hydrocarbyl group includes at least one uninterrupted chain of at least 8 methylene groups.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein said filterability improver is a diester.
Claim 4
Dependent Claim
31 words
The composition of claim 2 wherein said filterability improver contains one hydroxyl group, which is on the alpha- or beta-carbon atom relative to the carbonyl carbon atom of an ester group.
Claim 5
Dependent Claim
37 words
The composition of claim 1 wherein the filterability improver is prepared by reacting a C 10 -C 40 hydrocarbyl alcohol having at least one uninterrupted chain of at least 8 methylene groups, with a hydroxy-alkyl carboxylic acid.
Claim 6
Dependent Claim
17 words
The composition of claim 4 wherein the hydrocarbyl alcohol is a C 15 to C 25 alkanol.
Claim 7
Dependent Claim
16 words
The composition of claim 4 wherein the hydroxy-alkyl carboxylic acid is an alpha- or beta-hydroxy-dicarboxylic acid.
Claim 8
Dependent Claim
13 words
The composition of claim 4 wherein the hydroxy-alkyl carboxylic acid is malic acid.
Claim 9
Dependent Claim
20 words
The composition of claim 1 wherein the filterability improver is a di-C 15 to C 25 alkyl malic acid diester.
Claim 10
Dependent Claim
89 words
A middle distillate fuel composition of improved filterability comprising a middle distillate fuel and from 15 to 2500 parts per million of a combination of a pour-point depressant and a filterability improver, the ratio of the pour-point depressant to the filterability improver being in the range of from 75:25 to 25:75, and wherein said filterability improver is a C 10 -C 40 hydrocarbyl ester of a hydroxycarboxylic acid in which the C 10 -C 40 hydrocarbyl group includes at least one uninterrupted chain of at least 8 methylene groups.
Claim 11
Dependent Claim
89 words
A middle distillate fuel composition of improved filterability comprising a middle distillate fuel and from 15 to 2500 parts per million of a combination of a pour-point depressant and a filterability improver, the ratio of the pour-point depressant to the filterability improver being in the range of from 75:25 to 25:75, and wherein said filterability improver is a C 10 -C 40 hydrocarbyl ester of a hydroxycarboxylic acid in which the C 10 -C 40 hydrocarbyl group includes at least one uninterrupted chain of at least 8 methylene groups.
Claim 12
Dependent Claim
12 words
The composition of claim 9 wherein said filterability improver is a diester.
Claim 13
Dependent Claim
31 words
The composition of claim 10 wherein said filterability improver contains one hydroxyl group, which is on the alpha- or beta-carbon atom relative to the carbonyl carbon atom of an ester group.
Claim 14
Dependent Claim
37 words
The composition of claim 9 wherein the filterability improver is prepared by reacting a C 10 -C 40 hydrocarbyl alcohol having at least one uninterrupted chain of at least 8 methylene groups, with a hydroxy-alkyl carboxylic acid.
Claim 15
Dependent Claim
17 words
The composition of claim 12 wherein the hydrocarbyl alcohol is a C 15 to C 25 alkanol.
Claim 16
Dependent Claim
16 words
The composition of claim 12 wherein the hydroxy-alkyl carboxylic acid is an alpha- or beta-hydroxy-dicarboxylic acid.
Claim 17
Dependent Claim
13 words
The composition of claim 12 wherein the hydroxy-alkyl carboxylic acid is malic acid.
Claim 18
Dependent Claim
20 words
The composition of claim 9 wherein the filterability improver is a di-C 15 to C 25 alkyl malic acid diester.
Claim 19
Dependent Claim
14 words
The composition of claim 9 wherein the pour-point depressant is a polyalkylacrylate or methacrylate.
Claim 20
Dependent Claim
34 words
The composition of claim 9 wherein the pour-point depressant is a polyalkylacrylate or methacrylate having a molecular weight of from 2000 to 500,000, and wherein the alkyl groups are C 1 -C 30 alkyl.
Claim 21
Dependent Claim
20 words
The composition of claim 18 wherein the filterability improver is a di-C 15 to C 25 alkyl malic acid diester.
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) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |