Patent US3664955A successfully refreshed from Google Patents.
US3664955A
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Lubricating oil compositions of improved thermal stability
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1969-12-31
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Granted: 1972-05-23
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Expires: 1989-12-31
Abstract
Abstract Mineral lubricating oil compositions are prepared containing oil-soluble additives for sludge control, having improved high temperature oxidation stability and thus permitting longer periods of service before it becomes necessary to drain the used oil and replace it with fresh oil. The novel additive mixture is prepared by reacting elemental sulfur with long chain (C16 ) oilsoluble olefinically unsaturated monomeric or polymeric hydrocarbons, e.g. polyisobutylene, and using such sulfurized compounds in conjunction with conventional ashless dispersants with or without using additional ashless dispersants which have previously been reacted with elemental sulfur. Many of the hydrocarbons used as starting materials, in their unsulfurized state, have heretofore been used as viscosity index improvers in lubricating oil compositions.
Inventors
- 👤 Jerome Panzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:21
CPC Classifications
C; C10; C10M; C10M161/00; C10M2203/00; C10M2203/06; C10M2203/10; C10M2203/108; C10M2205/00; C10M2205/02; C10M2205/026; C10M2207/00; C10M2207/28; C10M2207/287; C10M2207/289; C10M2209/00; C10M2209/02; C10M2209/08; C10M2209/084; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/08; C10M2215/082; C10M2215/086; C10M2215/24; C10M2215/26; C10M2215/28; C10M2217/00; C10M2217/04; C10M2217/044; C10M2217/045; C10M2217/046; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/044; C10M2219/08; C10M2219/082; C10M2219/087; C10M2219/088; C10M2219/089; C10M2221/00; C10M2221/04; C10M2221/041; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/04; C10N2030/00; C10N2030/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
36 words
A lubricating oil composition as in claim 1 wherein the amount of sulfurized hydrocarbon and the amount of ashless sludge dispersant are each between about 0.05 and about 10.0 wt. percent of the total oil composition.
Claim 2
Dependent Claim
22 words
A lubricating oil composition as in claim 1 wherein the hydrocarbon subjected to sulfurization is at least one C16 monomeric alpha monoolefin.
Claim 3
Dependent Claim
21 words
A lubricating oil composition as in claim 3 wherein the hydrocarbon subjected to sulfurization is a mixture of C20 monoolefin monomers.
Claim 4
Dependent Claim
24 words
A lubricating oil composition as in claim 1 wherein the hydrocarbon subjected to sulfurization is at least one homopolymer of a C2-C18 alpha monoolefin.
Claim 5
Dependent Claim
17 words
A lubricating oil composition as in claim 5 wherein the hydrocarbon subjected to sulfurization is a polyisobutylene.
Claim 6
Dependent Claim
30 words
A lubricating oil composition as in claim 1 wherein the hydrocarbon subjected to sulfurization is at least one copolymer of a C2-C18 alpha monoolefin with a different C3-C18 alpha monoolefin.
Claim 7
Dependent Claim
21 words
A lubricating oil composition as in claim 7 wherein the hydrocarbon subjected to sulfurization is a copolymer of ethylene and propylene.
Claim 8
Dependent Claim
48 words
A lubricating oil composition as in claim 1 wherein the hydrocarbon subjected to sulfurization is at least one terpolymer of a C2-C18 alpha monoolefin, a different C3-C18 alpha monoolefin and a third monomer which is either a third and still different C3-C18 alpha monoolefin or a C4-C18 diolefin.
Claim 9
Dependent Claim
34 words
A lubricating oil composition as in claim 1 which also contains a minor sludge inhibiting amount of at least one sulfurized ashless dispersant wherein said ashless dispersant is as set forth in claim 4.
Claim 10
Dependent Claim
16 words
A lubricating oil composition as in claim 1 wherein the alkenyl radical is derived from polyisobutylene.
Claim 11
Dependent Claim
21 words
A lubricating oil composition as in claim 1 wherein said condensation product is obtained from tetraethylene pentamine and polyisobutenyl succinic anhydride.
Claim 12
Dependent Claim
21 words
A lubricating oil composition as in claim 1 wherein said condensation product is obtained from tetraethylene pentamine and polyisobutenyl propionic acid.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |