US4647290A
Expired / Lapsed
US
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Process and composition for color stabilized distillate fuel oils
Assignee: Veolia WTS USA Inc
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Filing: 1986-06-13
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Granted: 1987-03-03
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Expires: 2006-06-13
Abstract
Abstract This invention relates to processes and compositions for color stabilized distillate fuel oils, such as straight-run diesel fuel, which comprises an effective color stabilizing amount of (a) N-(2-aminoethyl)piperazine and (b) N,N-diethylhydroxylamine.
Inventors
- 👤 Dwight K. Reid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:09
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/222; C10L1/2222; C10L1/2225; C10L1/232
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
30 words
A process for inhibiting color deterioration of distillate fuel oil which comprises adding to said fuel oil an effective inhibiting amount of a mixture of (a) N-(2-aminoethyl)piperazine and (b) N,N-diethylhydroxylamine.
Claim 2
Dependent Claim
30 words
A process for inhibiting color deterioration of distillate fuel oil which comprises adding to said fuel oil an effective inhibiting amount of a mixture of (a) N-(2-aminoethyl)piperazine and (b) N,N-diethylhydroxylamine.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein said mixture is added in an amount from about 1.0 part to about 10,000 parts per million parts of said fuel oil.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein said mixture is added at ambient temperature and pressure.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the weight ratio of (a):(b) is from about 3:1 to about 1:3.
Claim 6
Dependent Claim
14 words
The process of claim 4 wherein the distillate fuel oil is straight-run diesel fuel.
Claim 7
Dependent Claim
14 words
The process of claim 5 wherein the weight ratio of (a):(b) is about 2:3.
Claim 8
Dependent Claim
30 words
The process of claim 5 or 6 wherein said mixture is added in an amount from about 1.0 part to about 1,500 parts per million parts of said diesel fuel.
Claim 9
Dependent Claim
23 words
A color stabilized distillate fuel oil composition comprising distillate fuel oil and an effective color stabilizing amount of (a) N-(2-aminoethyl)piperazine and (b) N,N-diethylhydroxylamine.
Claim 10
Dependent Claim
23 words
A color stabilized distillate fuel oil composition comprising distillate fuel oil and an effective color stabilizing amount of (a) N-(2-aminoethyl)piperazine and (b) N,N-diethylhydroxylamine.
Claim 11
Dependent Claim
29 words
The composition of claim 8 wherein the total amount of (a) and (b) is from about 1.0 part to about 10,000 parts per million parts of said fuel oil.
Claim 12
Dependent Claim
18 words
The composition of claim 8 wherein the weight ratio of (a):(b) is from about 3:1 to about 1:3.
Claim 13
Dependent Claim
14 words
The composition of claim 10 wherein the distillate fuel oil is straight-run diesel fuel.
Claim 14
Dependent Claim
14 words
The composition of claim 11 wherein the weight ratio of (a):(b) is about 2:3.
Claim 15
Dependent Claim
31 words
The composition of claim 11 or 12 wherein the total amount of (a) and (b) is from about 1.0 part to about 1,500 parts per million parts of said diesel fuel.
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 |