Patent US4460381A successfully refreshed from Google Patents.
US4460381A
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Process for stabilizing fuels and stabilized fuel produced thereby
Assignee: Texaco Inc
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Filing: 1983-05-11
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Granted: 1984-07-17
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Expires: 2003-05-11
Abstract
Abstract A process for stabilizing fuels during storage by blending therewith oxalic acid derivatives of mono- or bis-succinimides of polyalkylpolyamines. The fuels are stabilized by the presence of 10 to 100 parts per thousand barrels of these oxamides. For particular applications mixtures of mono- and bis-succinimides in varying proportions can be used.
Inventors
- 👤 Thomas J. Karol
- 👤 Rodney L. Sung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:38
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/222; C10L1/224; C10L1/234; C10L1/238; C10L1/2383
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
A process for stabilizing middle distillate and diesel fuels which comprises blending with said fuels from 10 to 100 parts per thousand barrels of at least one mono- or bis-imide oxamide of the formulas ##STR7## in which R is a hydrocarbyl radical having from 8 to 400 carbon atoms, x and y are numbers range from 0 to 6 whose additive total is from 1 to 6, R' is a hydrogen radical or a mono-, or bi-acyl radical of oxalic acid, and R" is a hydrogen or hydrocarbyl substituted succinic-N-ethylene radical having the formula: ##STR8##
Claim 2
Dependent Claim
95 words
A process for stabilizing middle distillate and diesel fuels which comprises blending with said fuels from 10 to 100 parts per thousand barrels of at least one mono- or bis-imide oxamide of the formulas ##STR7## in which R is a hydrocarbyl radical having from 8 to 400 carbon atoms, x and y are numbers range from 0 to 6 whose additive total is from 1 to 6, R' is a hydrogen radical or a mono-, or bi-acyl radical of oxalic acid, and R" is a hydrogen or hydrocarbyl substituted succinic-N-ethylene radical having the formula: ##STR8##
Claim 3
Dependent Claim
90 words
A stabilized middle distillate or diesel fuel containing from about 10 to about 100 parts per thousand barrels of at least one mono- or bis-imide oxamide of the formulas ##STR9## in which R is a hydrocarbyl radical having from 8 to 400 carbon atoms, x and y are numbers range from 0 to 6 whose additive total is from 1 to 6, R' is a hydrogen radical or a mono-, or bi-acyl radical of oxalic acid, and R" is a hydrogen or hydrocarbyl substituted succinic-N-ethylene radical having the formula: ##STR10##
Claim 4
Dependent Claim
90 words
A stabilized middle distillate or diesel fuel containing from about 10 to about 100 parts per thousand barrels of at least one mono- or bis-imide oxamide of the formulas ##STR9## in which R is a hydrocarbyl radical having from 8 to 400 carbon atoms, x and y are numbers range from 0 to 6 whose additive total is from 1 to 6, R' is a hydrogen radical or a mono-, or bi-acyl radical of oxalic acid, and R" is a hydrogen or hydrocarbyl substituted succinic-N-ethylene radical having the formula: ##STR10##
Claim 5
Dependent Claim
21 words
The fuel of claim 2, wherein R and R'" are hexadecenyl; X is 0; y is 6; and R' is hydrogen.
Claim 6
Dependent Claim
21 words
The fuel of claim 2 wherein R is polyisopropenyl; x is 6; y is 0; and R' and R" are hydrogen.
Claim 7
Dependent Claim
22 words
The fuel of claim 2, wherein R is polyisopropenyl; x and y are 3; R' is bioxalyl; and R" is alkenyl succinyl-N-ethylenyl.
Claim 8
Dependent Claim
23 words
The fuel of claim 2 wherein R is polyisopropenyl; x is 0; y is 4; R' is bioxalyl; and R" is alkenyl succinyl-N-ethylenyl.
Claim 9
Dependent Claim
14 words
The fuel of claim 2 containing a mixture of said mono- and bis-imide oxamides.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |