Patents by Inventor Donald J. Greenlee

Donald J. Greenlee 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).

  • Patent number: 9004160
    Abstract: A downhole tool that is used to seal a well bore. The downhole tool has at least one of a nose cap coupled to a slip means for converting shear forces into compression forces, a pultrusion rod, and a butterfly ring. The pultrusion rod extends the full length of the center mandrel. The butterfly ring includes a plurality of wedges configured to remove the extrusion gap when the tool is expanded to prevent failure of a sealing member over increased well bore diameters. The downhole tool includes a pressure equalization port to equalize pressure between a first and a second fluid volume during removal of the tool from the well bore.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: April 14, 2015
    Inventors: Donald J. Greenlee, Donald R. Greenlee
  • Publication number: 20140190682
    Abstract: A downhole tool that is used to seal a well bore. The downhole tool has at least one of a nose cap coupled to a slip means for converting shear forces into compression forces, a pultrusion rod, and a butterfly ring. The pultrusion rod extends the full length of the center mandrel. The butterfly ring includes a plurality of wedges configured to remove the extrusion gap when the tool is expanded to prevent failure of a sealing member over increased well bore diameters. The downhole tool includes a pressure equalization port to equalize pressure between a first and a second fluid volume during removal of the tool from the well bore.
    Type: Application
    Filed: January 9, 2013
    Publication date: July 10, 2014
    Inventors: Donald J. Greenlee, Donald R. Greenlee