Patent DE100391C successfully refreshed from Google Patents.
Patent US4502970A successfully refreshed from Google Patents.
US4502970A
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US
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Lubricating oil composition
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1983-05-12
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Granted: 1985-03-05
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Expires: 2003-05-12
Abstract
Abstract There is disclosed an improved lubricating oil composition useful in both gasoline and diesel engines which contains polyisobutenyl succinic anhydride as a supplemental dispersant-detergent in combination with a conventional lubricating oil dispersant.
Inventors
- 👤 Alan A. Schetelich
- 👤 Norman Tunkel
- 👤 Darrell W. Brownawell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:14
CPC Classifications
C; C10; C10M; C10M167/00; C10M129/00; C10M129/86; C10M129/92; C10M129/93; C10M129/95; C10M133/00; C10M133/52; C10M137/00; C10M137/02; C10M137/04; C10M137/10; C10M149/00; C10M149/02; C10M159/00; C10M159/12; C10M159/16; C10M159/20; C10M159/22; C10M159/24; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/027; C10M2207/028; C10M2207/10; C10M2207/12; C10M2207/121; C10M2207/123; C10M2207/129; C10M2207/22; C10M2207/26; C10M2207/262; C10M2207/28; C10M2207/282; C10M2207/287; C10M2207/288; C10M2207/289; C10M2207/34; C10M2209/00; C10M2209/02; C10M2209/10; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2215/08; C10M2215/082; C10M2215/22; C10M2215/221; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/26; C10M2215/28; C10M2215/30; C10M2217/00; C10M2217/02; C10M2217/022; C10M2217/023; C10M2217/024; C10M2217/028; C10M2217/04; C10M2217/043; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/046; C10M2219/08; C10M2219/082; C10M2219/087; C10M2219/088; C10M2219/089; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10M2227/00; C10M2227/06; C10M2227/061; C10N; C10N2010/00; C10N2010/04; F; F02; F02B; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
171 words
Crankcase lubricating oil composition effective in both gasoline and diesel internal combustion engines comprising a major amount of an oil of lubricating viscosity containing 0-15 wt. % of a viscosity index improver and (a) at least about 0.5 wt. % of a lubricating oil dispersant; (b) about 2 to 12 wt. % of an overbased metal detergent additive or mixtures thereof with neutral metal detergent additive, said metal detergent additive being selected from the group consisting of oil soluble calcium, magnesium and barium sulfonates, phenates, and sulfurized phenates; (c) a zinc dialkyl dithiophosphate anti-wear additive; and (d) a polyisobutenyl succinic anhydride having and Mn (number average) molecular weight of about 900 to 2000; wherein the weight ratio of said dispersant to said polyisobutenyl succinic anhydride is less than 1.75 when the amount of dispersant in the composition is about 3.5 wt. % or less and said weight ratio being less than about 7 when the amount of dispersant present is greater than 3.5 wt. % up to about 10 wt. %.
Claim 2
Dependent Claim
171 words
Crankcase lubricating oil composition effective in both gasoline and diesel internal combustion engines comprising a major amount of an oil of lubricating viscosity containing 0-15 wt. % of a viscosity index improver and (a) at least about 0.5 wt. % of a lubricating oil dispersant; (b) about 2 to 12 wt. % of an overbased metal detergent additive or mixtures thereof with neutral metal detergent additive, said metal detergent additive being selected from the group consisting of oil soluble calcium, magnesium and barium sulfonates, phenates, and sulfurized phenates; (c) a zinc dialkyl dithiophosphate anti-wear additive; and (d) a polyisobutenyl succinic anhydride having and Mn (number average) molecular weight of about 900 to 2000; wherein the weight ratio of said dispersant to said polyisobutenyl succinic anhydride is less than 1.75 when the amount of dispersant in the composition is about 3.5 wt. % or less and said weight ratio being less than about 7 when the amount of dispersant present is greater than 3.5 wt. % up to about 10 wt. %.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein the polyisobutenyl succinic anhydride has a Mn of about 1300.
Claim 4
Dependent Claim
21 words
The composition of claim 2 wherein said lubricating oil contains about 2.5 to 5 wt. % of the polyisobutenyl succinic anhydride.
Claim 5
Dependent Claim
19 words
The composition of claim 3 wherein the lubricating oil contains about 0.7 to 3 wt. % of the dispersant.
Claim 6
Dependent Claim
27 words
The composition of claim 4 wherein the dispersant is a borated polyisobutenyl succinic anhydride-polyalkylene amine reaction product, the polyisobutenyl having a Mn of about 900 to 2,000.
Claim 7
Dependent Claim
25 words
The composition of claim 1 further comprising effective amounts of an antioxidant, anti-rust additive, anti-foamant and friction reducing additive to provide their normal attendant functions.
Claim 8
Dependent Claim
33 words
The composition of claim 1 wherein the metal detergent additive is a mixture of overbased magnesium sulfurized phenate and neutral calcium sulfurized phenate present in an amount of about 3 to 6 wt%.
Claim 9
Dependent Claim
23 words
The composition of claim 1 wherein there is present about 1-3 wt % of the zinc dialkyldithio-phosphate, the alkyl having 5-8 carbon atoms.
Claim 10
Dependent Claim
13 words
The composition of claim 1 wherein the dispersant is a dispersant-viscosity index improver.
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) | 1988-03-04 | 1988-09-03 | 1989-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-04 | 1992-09-03 | 1993-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-04 | 1996-09-03 | 1997-03-05 | $7700.00 | Window Closed / Lapsed |