Patents by Inventor John N Yokley

John N Yokley 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).

  • Slip assembly for hanging an elongate member within a wellbore
    Patent number: 6761221
    Abstract: A slip assembly carried about a liner for lowering into a wellbore includes a C-ring having an inner conical surface contracted about a matching outer surface of the liner and held in contracted position by disposal of its end closely within a recess in the member. When its end is raised from the recess, the c-ring expands to cause its teeth to engage with the wellbore, whereby the liner may be lowered to further expand the c-ring to cause its teeth to dig into the wellbore to suspend the liner therefrom.
    Type: Grant
    Filed: May 2, 2002
    Date of Patent: July 13, 2004
    Assignee: Dril-Quip, Inc.
    Inventors: John N. Yokley, Larry E. Reimert
  • Apparatus for suspending a pipe within a well casing
    Patent number: 6722428
    Abstract: An apparatus suspends a pipe from the lower end of a tubular body positioned concentrically within an outer casing. Pockets are formed about the outer circumference of the body, each to receive a cone having an inner conical side adjacent the inner wall of each pocket, and a slip having an inner conical side adjacent an outer conical side of the cone. Slots are formed in side walls of the pocket for guiding the slip an securing the slip and cone with respect to the body.
    Type: Grant
    Filed: May 16, 2002
    Date of Patent: April 20, 2004
    Assignee: Dril-Quip, Inc.
    Inventor: John N. Yokley
  • Apparatus for use in cementing an inner pipe within an outer pipe within a wellbore
    Patent number: 6698513
    Abstract: There is disclosed apparatus for use in cementing a liner within an outer casing, wherein a ball is lowered into a diverter and thus guided into a pocket in one side thereof to permit passage of a pump down plug into a lower wiper plug.
    Type: Grant
    Filed: May 2, 2002
    Date of Patent: March 2, 2004
    Assignee: Dril-Quip, Inc.
    Inventor: John N Yokley
  • Apparatus for suspending a pipe within a well casing
    Publication number: 20020170709
    Abstract: Apparatus is disclosed for use in suspending a pipe from the lower end of a tubular body concentrically within an outer casing. Pockets are formed about the outer circumference of the body each to receive a cone having an inner conical side adjacent the inner wall of a pocket, and a slip having an inner conical side adjacent outer conical side of the cone.
    Type: Application
    Filed: May 16, 2002
    Publication date: November 21, 2002
    Inventor: John N. Yokley