Patents Represented by Attorney, Agent or Law Firm A. W. Klassen
  • Base stock lube oil manufacturing process
    Patent number: 6264826
    Abstract: A process is provided for preparing high quality Group II and Group III lubricating base oils from a sulfur containing feedstock using mild hydrotreating followed by isomerization/dewaxing followed by hydrogenation over a sulfur resistant hydrogenation catalyst.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: July 24, 2001
    Assignee: Chevron U.S.A Inc.
    Inventors: Jirong Xiao, Phil Winslow, James N. Ziemer