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. 29, 1987
Filed:
Jan. 30, 1986
Applicant:
Inventors:
Feike de Jong, Amsterdam, NL;
Jacob Vermeule, Amsterdam, NL;
Assignee:
Shell Oil Company, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C10M / ;
U.S. Cl.
CPC ...
252 405 ; 252 42 ;
Abstract
Lubricating oil compositions, prepared by the addition of at least one basic salts comprising polyvalent metal salt of naphthenic acids to at least one hydrocarbon lubricating oil, are stabilized above 140.degree. C. by the addition of at least one polyester, or salt of said polyester. The polyesters lead to marked improvement in stability even when used in low concentrations.