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US4401580A
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Lubricant composition containing an alkali metal borate and an ester-polyol compound
Assignee: Chevron USA Inc
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Filing: 1982-04-05
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Granted: 1983-08-30
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Expires: 2002-04-05
Abstract
Abstract Disclosed is a lubricant composition containing an oil of lubricating viscosity having dispersed therein a particulate hydrated alkali-metal borate and an effective amount of a ester-polyol compound which stabilizes the composition against the adverse effects of water contamination.
Inventors
- 👤 Kenneth Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:49
CPC Classifications
C; C10; C10M; C10M141/00; C10M141/02; C10M2201/00; C10M2201/087; C10M2207/00; C10M2207/28; C10M2207/287; C10M2207/289
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
42 words
A lubricant composition comprising an oil of lubricating viscosity having dispersed therein: (a) 0.1 to 60 weight percent of a particulate hydrated alkali-metal borate and (b) an effective amount of an ester-polyol compound to prevent the accumulation of seal damaging borate deposits.
Claim 2
Dependent Claim
42 words
A lubricant composition comprising an oil of lubricating viscosity having dispersed therein: (a) 0.1 to 60 weight percent of a particulate hydrated alkali-metal borate and (b) an effective amount of an ester-polyol compound to prevent the accumulation of seal damaging borate deposits.
Claim 3
Dependent Claim
29 words
The lubricant composition of claim 1 having dispersed therein 0.25 to 2.5 weight percent of said ester-polyol compound, and wherein said ester-polyol compound contains at least 10 carbon atoms.
Claim 4
Dependent Claim
29 words
The lubricant composition of claim 1 having dispersed therein 0.25 to 0.50 weight percent of said ester-polyol compound, and wherein said ester-polyol compound contains 12 to 24 carbon atoms.
Claim 5
Dependent Claim
25 words
The lubricant composition of claim 1, 2 or 3 wherein said ester-polyol compound is selected from sorbitan monooleate, pentaerythritol monooleate, sorbitan monolaurate, or glycerol monoricinoleate.
Claim 6
Dependent Claim
44 words
The lubricant composition of claim 1 wherein said ester-polyol cmpound is of the formula: (HO).sub.d (C.sub.n H.sub.2n+2-b-d)(OCOR).sub.b wherein: n is 3 to 30 b is 1 to 4 d is 2 to 5 R is an aliphatic hydrocarbyl of 1 to 30 carbon atoms.
Claim 7
Dependent Claim
36 words
The lubricant composition of claim 5 wherein in the formula n is 3 to 6, b is 1 to 3, d is 2 to 4 and R is an alkyl of 1 to 20 carbon atoms.
Claim 8
Dependent Claim
18 words
The lubricant composition of claim 6 having dispersed therein 0.25 to 0.50 weight percent of said ester-polyol compound.
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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |