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:
Sep. 24, 1996
Filed:
Jun. 07, 1995
Applicant:
Inventors:
Doris Love, Fishkill, NY (US);
Alison E Hadowanetz, Maybrook, NY (US);
Assignee:
Ethyl Additives Corporation, Richmond, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
558177 ; 5082 / ;
Abstract
A method for producing an ashless, antioxidant lubricating oil additive. The method comprises: (a) reacting an alcohol with phosphorus pentasulfide to form a dithiophosphoric acid intermediate; (b) treating the dithiophosphoric acid intermediate with an expoxide to yield a corresponding dithiophosphoric ester alcohol product; and (c) recovering the dithiophosphoric ester alcohol product lubricant oil additive.