Patents by Inventor Jirong Xiao

Jirong Xiao has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • 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
  • Base stock lube oil manufacturing process
    Patent number: 5993644
    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: June 26, 1997
    Date of Patent: November 30, 1999
    Assignee: Chevron U.S.A. Inc.
    Inventors: Jirong Xiao, Phil Winslow, James N. Ziemer