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:
Jun. 05, 1979
Filed:
May. 19, 1978
Applicant:
Inventors:
Assignee:
Idemitsu Kosan Company Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C10G / ; C10G / ;
U.S. Cl.
CPC ...
208264 ; 208 18 ; 208 19 ;
Abstract
Base stocks for lubricating oil with excellent thermal stability are produced by hydrofinishing a mixture consisting of 10 to 60 percent by volume of a neutralized extract and 90 to 40 percent by volume of an unextracted intermediate distillate product of low total acid value, in which the neutralized extract is prepared by alkaline treating and vacuum distillation of a extract obtained by solvent extraction of said intermediate distillate product by a solvent having affinity for aromatic compounds.