Patent US4919685A successfully refreshed from Google Patents.
US4919685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable middle distillate fuel-oil compositions
Assignee: Texaco Inc
•
Filing: 1988-12-22
•
Granted: 1990-04-24
•
Expires: 2008-12-22
Abstract
Abstract A stable middle distillate fuel-oil composition which comprises (a) a major portion of a middle distillate fuel-oil; and (b) a minor amount, as a storage stabilizing additive, of an aliphatic N(N',N'-dimethyl aminopropyl) succinimide of a copolymer and maleic anhydride graft.
Inventors
- 👤 Sheldon Herbstman
- 👤 Theodore E. Nalesnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:51
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/234; C10L1/236; C10L1/2364; C10L1/238; C10L1/2383
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
A stable middle distillate fuel-oil composition comprising: (a) a major portion of a middle distillate fuel-oil; and (b) a minor amount of, as a storage stabilizing additive, an aliphatic succinimide and/or aliphatic polyamine succinimide of a copolymer of the formula ##STR8## wherein (CP) is copolymer of ethylene and a (C 3 -C 18 ) alpha monoolefin, R is an aryl group, a (C 3 -C 18 ) alkyl group, a (C 2 -C 10 ) alkenyl group, or an alkyl polytertiary amine including ##STR9## wherein R' and R" are each an alkyl, alkenyl or aryl group, n=1-4, m=1-4 and y=1-4 or ##STR10## wherein X is O, S or N-R' and z=1-6.
Claim 2
Dependent Claim
111 words
A stable middle distillate fuel-oil composition comprising: (a) a major portion of a middle distillate fuel-oil; and (b) a minor amount of, as a storage stabilizing additive, an aliphatic succinimide and/or aliphatic polyamine succinimide of a copolymer of the formula ##STR8## wherein (CP) is copolymer of ethylene and a (C 3 -C 18 ) alpha monoolefin, R is an aryl group, a (C 3 -C 18 ) alkyl group, a (C 2 -C 10 ) alkenyl group, or an alkyl polytertiary amine including ##STR9## wherein R' and R" are each an alkyl, alkenyl or aryl group, n=1-4, m=1-4 and y=1-4 or ##STR10## wherein X is O, S or N-R' and z=1-6.
Claim 3
Dependent Claim
30 words
The stable middle distillate fuel-oil composition of claim 1 wherein said aliphatic is a (C 1 -C 10 ) alkyl group or a (C 2 -C 18 ) alkenyl group.
Claim 4
Dependent Claim
23 words
The stable middle distillate fuel-oil composition of claim 1 wherein the copolymer has a molecular weight ranging from about 5,000 to about 500,000.
Claim 5
Dependent Claim
18 words
The stable middle distillate fuel-oil composition of claim 1 wherein said composition is a diesel fuel/heating oil composition.
Claim 6
Dependent Claim
17 words
The stable middle distillate fuel-oil composition of claim 1 wherein said stabilizing additive is N,N-dimethylamino polyamine succinimide.
Claim 7
Dependent Claim
32 words
The stable middle distillate fuel-oil composition of claim 1 wherein said alkyl polytertiary amine is selected from the group consisting of N,N-diethylamino propylamine, N,N-dimethylamino ethylamine, N,N-diphenylpropylamine, Aminopropylmorpholine, Aminoethylmorpholine, 4-methylpiperazinepropylamine, 4-methylpiperazinethylamine and 4-ethylpiperazinepropylamine.
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) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |