The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 14, 1999
Filed:
Sep. 08, 1993
Applicant:
Inventor:
Elaine S Yamaguchi, El Cerrito, CA (US);
Assignee:
Chevron Chemical Company LLC, San Francisco, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C10M / ;
U.S. Cl.
CPC ...
508189 ; 508375 ;
Abstract
A lubricating oil composition has an oil of lubricating viscosity, plus minor portions of alkylated aminophenol and zinc dithiophosphate. Preferably, about 75 mol % of the alkyl groups of the zinc dithiophosphate are derived from primary alcohols. The alkylated aminophenol can be a borated 4-alkyl-2-aminophenol having, as its alkyl group, a polypropylene tetramer having from 18 to 30 carbon atoms.