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:
Mar. 02, 1976
Filed:
Oct. 20, 1971
Applicant:
Inventors:
Millard C Bryson, Conway, PA (US);
Harry C Murphy, Jr, Apollo, PA (US);
James R Murphy, Houston, TX (US);
Harry C Stauffer, Cheswick, PA (US);
Assignee:
Gulf Research & Development Company, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C10G / ; C10G / ; C10G / ;
U.S. Cl.
CPC ...
208 80 ; 208 18 ; 208 59 ; 208 78 ; 208111 ;
Abstract
A process for the production of lubricating oil in order to obtain lower viscosity lubricating oils of increased viscosity index by separating a crude lubricating oil into a residual fraction and a distillate fraction and thereafter subjecting the residual fraction to hydrotreating and separately subjecting the distillate fraction to hydrotreating under more severe conditions than employed in hydrotreating the residual fraction.