Patents by Inventor Don C. Gramlich

Don C. Gramlich 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).

  • Mechanical bi-directional isolation valve
    Patent number: 9784057
    Abstract: A valve having a sealing surface that is rotated 90 degrees on axial floating hinge assemblies is provided. A sleeve moves into position to protect the valve mechanism when the valve is in an open position. A sleeve locks the valve sealing element in place in either a closed or open position. The valve may be used during drilling of wells to prevent flow into the casing when the drill pipe and bit are raised above the valve.
    Type: Grant
    Filed: April 30, 2008
    Date of Patent: October 10, 2017
    Assignee: WEATHERFORD TECHNOLOGY HOLDINGS, LLC
    Inventors: Sam S. Lloyd, Michael R. Reaves, Don C. Gramlich
  • Mechanical Bi-Directional Isolation Valve
    Publication number: 20090272539
    Abstract: A valve having a sealing surface that is rotated 90 degrees on axial floating hinge assemblies is provided. A sleeve moves into position to protect the valve mechanism when the valve is in an open position. A sleeve locks the valve sealing element in place in either a closed or open position. The valve may be used during drilling of wells to prevent flow into the casing when the drill pipe and bit are raised above the valve.
    Type: Application
    Filed: April 30, 2008
    Publication date: November 5, 2009
    Applicant: Hemiwedge Valve Corporation
    Inventors: Sam S. Lloyd, Michael R. Reaves, Don C. Gramlich