US4493776A
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Lubricating oil composition with supplemental rust inhibitor
Assignee: Shell USA Inc
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Filing: 1982-09-30
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Granted: 1985-01-15
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Expires: 2002-09-30
Abstract
Abstract A lubricating oil composition for internal combustion engines having superior rust and corrosion inhibition is disclosed. The composition comprises a major amount of a hydrocarbon oil of lubricating viscosity and a minor amount of conventional additives, including an overbased detergent (such as calcium carbonate or calcium hydroxide) for rust protection and an ashless dispersant (such as the reaction product of substituted succinic acid or anhydrides with amines). The composition also includes a supplemental rust inhibitor (SRI) additive which is a combination of an effective amount of a supplemental rust inhibitor (SRI) additive comprising a combination of (A) R 1 O[C 2 H 4 O] x H and/or R 2 O[C 3 H 6 O] y H with (B) R 3 O[C 2 H 4 O] x [C 3 H 6 O] y H and/or R 4 O[C 3 H 6 O] y [C 2 H 4 O] x H, wherein R 1 , R 2 , R 3 and R 4 are hydrocarbyl radicals selected from alkyl, aryl, alkaryl, and arylalkyl groups or combinations thereof having from about 10 to about 24 carbon atoms; and wherein x and y may vary independently in the range from 3 to about 15.
Inventors
- 👤 Robert B. Rhodes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:13
CPC Classifications
C; C10; C10M; C10M167/00; C10M129/00; C10M129/86; C10M129/95; C10M133/00; C10M133/52; C10M133/56; C10M145/00; C10M145/18; C10M145/24; C10M145/26; C10M145/28; C10M145/30; C10M145/34; C10M145/36; C10M159/00; C10M159/12; C10M159/20; C10M159/22; C10M159/24; C10M2205/00; C10M2205/06; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/028; C10M2207/26; C10M2207/262; C10M2207/28; C10M2207/34; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/104; C10M2209/105; C10M2209/107; C10M2209/108; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/086; C10M2215/24; C10M2215/26; C10M2215/28; C10M2217/00; C10M2217/04; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/046; C10M2219/08; C10M2219/082; C10M2219/087; C10M2219/089; C10N; C10N2030/00; C10N2030/12; C10N2040/00; C10N2040/25; C10N2040/251; C10N2040/255; C10N2040/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
166 words
A lubricating oil composition for internal combustion engines comprising: a major amount of a hydrocarbon oil of lubricating viscosity and a minor amount of conventional additives, including at least one overbased detergent additive for rust protection and at least one ashless dispersant, and an effective amount of a supplemental rust inhibitor containing at least one compound selected from each of the groups consisting of (A) R 1 O[C 2 H 4 O] x H and R 2 O[C 3 H 6 O] y H with (B) R 3 O[C 2 H 4 O] x [C 3 H 6 O] y H and R 4 O[C 3 H 6 O] y [C 2 H 4 O] x H, wherein R 1 , R 2 , R 3 and R 4 are hydrocarbyl radicals selected from alkyl, aryl, alkaryl, and arylalkyl groups or combinations thereof having from about 10 to 15 carbon atoms and wherein x and y may vary independently in the range from 3 to 8.
Claim 2
Dependent Claim
166 words
A lubricating oil composition for internal combustion engines comprising: a major amount of a hydrocarbon oil of lubricating viscosity and a minor amount of conventional additives, including at least one overbased detergent additive for rust protection and at least one ashless dispersant, and an effective amount of a supplemental rust inhibitor containing at least one compound selected from each of the groups consisting of (A) R 1 O[C 2 H 4 O] x H and R 2 O[C 3 H 6 O] y H with (B) R 3 O[C 2 H 4 O] x [C 3 H 6 O] y H and R 4 O[C 3 H 6 O] y [C 2 H 4 O] x H, wherein R 1 , R 2 , R 3 and R 4 are hydrocarbyl radicals selected from alkyl, aryl, alkaryl, and arylalkyl groups or combinations thereof having from about 10 to 15 carbon atoms and wherein x and y may vary independently in the range from 3 to 8.
Claim 3
Dependent Claim
20 words
The lubricating oil composition of claim 1 wherein the overbased detergent additive is selected from alkaline earth carbonates and hydroxides.
Claim 4
Dependent Claim
34 words
The lubricating oil composition of claim 2 wherein the overbased detergent additive comprises calcium carbonate and/or calcium hydroxide and the ashless dispersant comprises the reaction product of substituted succinic acid or anhydrides with amines.
Claim 5
Dependent Claim
23 words
The lubricating oil composition of claim 1 wherein the SRI additive component (A) is selected from dodecyl penta(oxypropylene) propanol to pentadecyl penta(oxypropylene) propanol.
Claim 6
Dependent Claim
21 words
The lubricating oil of claim 1 wherein the SRI additive component (B) is a mixture of dodecyl to pentadecyl tetra(oxyethylene)tetra(oxypropylene) propanol.
Claim 7
Dependent Claim
20 words
The lubricating oil of claim 1 wherein the SRI additive component (B) is a mixture of dodecyl to pentadecyltetra(oxypropylene)tetra(oxyethylene) propanol.
Claim 8
Dependent Claim
39 words
The lubricating oil composition of claim 1 wherein the SRI additive component (A) consists of from about 0.05 to about 1% wt and component (B) consists of from about 0.2 to about 1.5% wt, of the lubricating oil composition.
Claim 9
Dependent Claim
178 words
An improved method of operating internal combustion engines to inhibit rust formation which comprises lubricating said engine with an oil comprising: a major amount of a hydrocarbon oil of lubricating viscosity and a minor amount of conventional additives, including at least one overbased detergent additive for rust protection and at least one ashless dispersant, and an effective amount of a supplemental rust inhibitor containing at least one compound selected from each of the groups consisting of (A) R 1 O[C 2 H 4 O] x H and R 2 O[C 3 H 6 O] y H with (B) R 3 O[C 2 H 4 O] x [C 3 H 6 O] y H and R 4 O[C 3 H 6 O] y [C 2 H 4 O] x H, wherein R 1 , R 2 , R 3 and R 4 are hydrocarbyl radicals selected from alkyl, aryl, alkaryl, and arylalkyl groups or combinations thereof having from about 10 to 15 carbon atoms and wherein x and y may vary independently in the range from 3 to 8.
Claim 10
Dependent Claim
178 words
An improved method of operating internal combustion engines to inhibit rust formation which comprises lubricating said engine with an oil comprising: a major amount of a hydrocarbon oil of lubricating viscosity and a minor amount of conventional additives, including at least one overbased detergent additive for rust protection and at least one ashless dispersant, and an effective amount of a supplemental rust inhibitor containing at least one compound selected from each of the groups consisting of (A) R 1 O[C 2 H 4 O] x H and R 2 O[C 3 H 6 O] y H with (B) R 3 O[C 2 H 4 O] x [C 3 H 6 O] y H and R 4 O[C 3 H 6 O] y [C 2 H 4 O] x H, wherein R 1 , R 2 , R 3 and R 4 are hydrocarbyl radicals selected from alkyl, aryl, alkaryl, and arylalkyl groups or combinations thereof having from about 10 to 15 carbon atoms and wherein x and y may vary independently in the range from 3 to 8.
References Cited (Backward Citations)
US3933662A
Cited
US3784474A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |