Patents by Inventor Qin SHIWEI

Qin SHIWEI 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).

  • Roller cone drill bit assembly with varying radius bearing surfaces
    Patent number: 9957756
    Abstract: A roller cone drill bit assembly with a bearing shaft having an outer bearing surface and defining a rotational axis. The outer bearing surface includes a necked portion having a varying radius with respect to the rotational axis. A roller cone is coupled about the bearing shaft and includes an outer cutting structure and an inner bearing surface. The inner bearing surface includes a necked portion proximate to and closely conforming to the necked portion of the outer bearing surface.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: May 1, 2018
    Assignee: HALLIBURTON ENERGY SERVICES, INC.
    Inventor: Qin Shiwei
  • ROLLER CONE DRILL BIT ASSEMBLY WITH VARYING RADIUS BEARING SURFACES
    Publication number: 20170159364
    Abstract: A roller cone drill bit assembly with a bearing shaft having an outer bearing surface and defining a rotational axis. The outer bearing surface includes a necked portion having a varying radius with respect to the rotational axis. A roller cone is coupled about the bearing shaft and includes an outer cutting structure and an inner bearing surface. The inner bearing surface includes a necked portion proximate to and closely conforming to the necked portion of the outer bearing surface.
    Type: Application
    Filed: July 2, 2014
    Publication date: June 8, 2017
    Applicant: HALLIBURTON ENERGY SERVICES, INC.
    Inventor: Qin SHIWEI