US4514312A
Expired / Lapsed
US
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Lubricant compositions comprising a phosphate additive system
Assignee: Witco Corp
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Filing: 1984-04-12
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Granted: 1985-04-30
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Expires: 2004-04-12
Abstract
Abstract A lubricant composition having special utility as a lubricant in constant velocity universal joints of the type used in front wheel drive vehicles. The composition comprises a low sulfur lubricating oil base grease and an additive package comprising a mixture of an oil soluble, sulfur-free organic compound and an oil insoluble sulfur-free inorganic compound.
Inventors
- 👤 Jon C. Root
- 👤 John F. Barnes
- 👤 Jack E. Coovert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:06
CPC Classifications
C; C10; C10M; C10M141/00; C10M141/10; C10M119/00; C10M119/24; C10M125/00; C10M125/24; C10M137/00; C10M137/02; C10M137/04; C10M137/08; C10M169/00; C10M169/06; C10M2201/00; C10M2201/085; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/043
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
103 words
A lubricant composition for use under extreme pressure conditions while being substantially inert with respect to elastomeric substances over a wide temperature range, comprising: a major proportion of a low-sulfur lubricating oil base grease, and a minor proportion of an additive system consisting essentially of a mixture of an oil-soluble, sulfur-free organic phosphate or phosphite and one or more oil-insoluble, sulfur-free inorganic phosphates, said additive system being present in an amount sufficient to impart extreme pressure properties to the lubricant composition, while at the same time being substantially inert with respect to elastomeric substances with which the lubricant composition may come into contact.
Claim 2
Dependent Claim
103 words
A lubricant composition for use under extreme pressure conditions while being substantially inert with respect to elastomeric substances over a wide temperature range, comprising: a major proportion of a low-sulfur lubricating oil base grease, and a minor proportion of an additive system consisting essentially of a mixture of an oil-soluble, sulfur-free organic phosphate or phosphite and one or more oil-insoluble, sulfur-free inorganic phosphates, said additive system being present in an amount sufficient to impart extreme pressure properties to the lubricant composition, while at the same time being substantially inert with respect to elastomeric substances with which the lubricant composition may come into contact.
Claim 3
Dependent Claim
26 words
A lubricant composition according to claim 1 wherein the lubricating oil base grease contains a mono- or polyurea, or a mixture thereof, as a thickening agent.
Claim 4
Dependent Claim
21 words
A lubricant composition according to claim 1 wherein the sulfur-free organic phosphate is an alkyl, aryl or alkylaryl phosphate or phosphite.
Claim 5
Dependent Claim
17 words
A lubricant composition according to claim 1 wherein the sulfur-free organic phosphate is an aromatic amine phosphate.
Claim 6
Dependent Claim
20 words
A lubricant composition according to claim 1 wherein the sulfur-free inorganic phosphate is an alkali or alkaline earth metal phosphate.
Claim 7
Dependent Claim
28 words
A lubricant composition according to claim 1 wherein the ratio of sulfur-free inorganic phosphate or phosphite to sulfur-free organic phosphate in the additive system is from about 1:8.
Claim 8
Dependent Claim
26 words
A lubricant composition according to claim 1 wherein the sulfur-free inorganic phosphate moiety of the additive system comprises a mixture of dicalcium phosphate and monocalcium phosphate.
Claim 9
Dependent Claim
23 words
A lubricant composition according to claim 1 wherein the additive system comprises from about 1% to about 40% by weight of the composition.
Claim 10
Dependent Claim
15 words
A lubricant composition according to claim 1 wherein an antioxidant is incorporated in the composition.
Claim 11
Dependent Claim
18 words
A lubricant composition according to claim 1 wherein the composition contains a minor amount of a corrosion inhibitor.
Claim 12
Dependent Claim
15 words
A lubricant composition according to claim 1 wherein the sulfur-free inorganic phosphate is dicalcium phosphate.
Claim 13
Dependent Claim
19 words
A lubricant composition according to claim 9 wherein the antioxidant is 2,6-di-tert-butyl-dimethylamine-p-cresol or 4,4'-methylene bis (2,6-di-tert-butylphenol) or butylated hydroxytoluene.
Claim 14
Dependent Claim
14 words
A lubricant composition according to claim 10 wherein the corrosion inhibitor is sodium nitrate.
Claim 15
Dependent Claim
22 words
A lubricant composition according to claim 1 wherein the additive system comprises from 10% to about 15% by weight of the composition.
Claim 16
Dependent Claim
21 words
A lubricant composition according to claim 1 wherein the lubricating oil base grease contains less than 1% by weight of sulfur.
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) | 1988-04-29 | 1988-10-29 | 1989-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-29 | 1992-10-29 | 1993-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-29 | 1996-10-29 | 1997-04-30 | $7700.00 | Window Closed / Lapsed |