Patents by Inventor Zhou Yong

Zhou Yong 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).

  • Drill bit inserts with zone of compressive residual stress
    Patent number: 6260639
    Abstract: A cutter element for use in a drill bit, has a substrate comprising a grip portion and an extension and at least a cutting layer affixed to said substrate. The cutting layer has a cutting surface and an interface surface, and the cutting surface includes a region of residual compressive stress, which functions as a preload or prestress so as to offset the effect of localized loading due to contact with the formation during drilling.
    Type: Grant
    Filed: April 16, 1999
    Date of Patent: July 17, 2001
    Assignee: Smith International, Inc.
    Inventors: Zhou Yong, S. J. Huang