US4353807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricants and fuels containing boroxarophenanthrene compounds
Assignee: Mobil Oil AS
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Filing: 1981-03-24
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Granted: 1982-10-12
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Expires: 2001-03-24
Abstract
Abstract The present invention relates to 9-hydroxy-9,10-boroxarophenanthrene compositions which are particularly suitable additives to improve the stability of lubricating oils and fuel compositions. More particularly, esters of 9-hydroxy-9,10-boroxarophenanthrene which are formed from hindered phenols have been found to have improved and sustained oil solubility and comprise hydrolytically stable antioxidants which, in minor amounts, have been found to impart to oils of lubricating viscosity a high level of protection against oxidative degradation.
Inventors
- 👤 Milton Braid
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:31
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/02; C07F5/025; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/30; C10L1/301; C10L1/303; C10M; C10M139/00; C10M2227/00; C10M2227/06; C10M2227/061; C10M2227/062; C10M2227/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
40 words
A compound of the formula ##STR6## wherein R' is a hydrocarbyl group containing 1 to 30 carbon atoms, n may be 0 or an integer of 1 to 4, and Ar is an aromatic moiety derived from a hindered phenol.
Claim 2
Dependent Claim
40 words
A compound of the formula ##STR6## wherein R' is a hydrocarbyl group containing 1 to 30 carbon atoms, n may be 0 or an integer of 1 to 4, and Ar is an aromatic moiety derived from a hindered phenol.
Claim 3
Dependent Claim
76 words
The compound of claim 1 wherein Ar is ##STR7## and where R" is an alkyl or aralkyl group, in which the carbon bonded to the ring carbon is itself bonded to at least two other carbon atoms, and which contains 3 to 20 carbon atoms and Y is hydrogen, an alkyl group of from 1 to 20 carbon atoms, an alkoxy group, a carbalkoxy group, the alkoxy and carbalkoxy groups containing 1 to 20 carbon atoms.
Claim 4
Dependent Claim
11 words
The compound of claim 2 wherein R" is an alkyl group.
Claim 5
Dependent Claim
11 words
The compound of claim 3 wherein R" is the tertiarybutyl group.
Claim 6
Dependent Claim
28 words
A lubricant or liquid hydrocarbon fuel composition comprising a major proportion of a lubricant or liquid hydrocarbon fuel and an antioxidant amount of the compound of claim 1.
Claim 7
Dependent Claim
26 words
A lubricant or liquid hydrocarbon fuel composition comprising a major proportion of a lubricant or fuel and an antioxidant amount of the compound of claim 2.
Claim 8
Dependent Claim
26 words
A lubricant or liquid hydrocarbon fuel composition comprising a major proportion of a lubricant or fuel and an antioxidant amount of the compound of claim 3.
Claim 9
Dependent Claim
26 words
A lubricant or liquid hydrocarbon fuel composition comprising a major proportion of a lubricant or fuel and an antioxidant amount of the compound of claim 4.
Claim 10
Dependent Claim
16 words
The composition of claims 5, 6, 7 or 8 wherein said lubricant is a mineral oil.
Claim 11
Dependent Claim
16 words
The composition of claims 5, 6, 7 or 8 wherein said lubricant is a synthetic oil.
Claim 12
Dependent Claim
27 words
The composition of claims 5, 6, 7 or 8 wherein said lubricant is a mixture of mineral and synthetic oils in the combination mineral-mineral, synthetic-synthetic or mineral-synthetic.
Claim 13
Dependent Claim
15 words
The composition of claims 5, 6, 7 or 8 wherein said lubricant is a grease.
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) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |