Patents by Inventor Qingxiu Li

Qingxiu Li 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).

  • HIGHLY WEAR RESISTANT COMPOSITE ROTARY SEALS WITH WEAR LAYER AT INNER DIAMETER AND/OR OUTER DIAMETER EMBEDDED INSIDE OR BETWEEN RUBBER LAYERS
    Publication number: 20120312602
    Abstract: A composite journal seal for use in a roller cone drill bit may include a substantially ring shaped elastomeric body having at least two axial, radial, or canted sealing surfaces, at least one of the at least two axial, radial, or canted sealing surface being a dynamic sealing surface, and at least one reinforcement layer embedded at least 0.005 inches from the at least one dynamic sealing surface.
    Type: Application
    Filed: June 8, 2012
    Publication date: December 13, 2012
    Applicant: SMITH INTERNATIONAL, INC.
    Inventors: Ming Zhang, Qingxiu Li, Zhou Yong