Patents by Inventor Richard J. Donahue

Richard J. Donahue 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).

  • Piston
    Patent number: 7506575
    Abstract: A number of embodiments of a piston may have a shape that provides enhanced piston guidance. In such embodiments, the piston shape may include an axial profile that is configured to provide certain thrust load characteristics.
    Type: Grant
    Filed: October 11, 2007
    Date of Patent: March 24, 2009
    Assignee: Dresser, Inc.
    Inventor: Richard J. Donahue
  • Piston
    Patent number: 7493850
    Abstract: A number of embodiments of a piston may have a shape that provides enhanced piston guidance. In such embodiments, the piston shape may include an axial profile that is configured to provide certain thrust load characteristics.
    Type: Grant
    Filed: February 22, 2007
    Date of Patent: February 24, 2009
    Assignee: Dresser, Inc.
    Inventor: Richard J. Donahue
  • Piston
    Patent number: 7302884
    Abstract: A number of embodiments of a piston may have a shape that provides enhanced piston guidance. In such embodiments, the piston shape may include an axial profile that is configured to provide certain thrust load characteristics.
    Type: Grant
    Filed: November 3, 2005
    Date of Patent: December 4, 2007
    Assignee: Dresser, Inc.
    Inventor: Richard J. Donahue
  • Piston
    Patent number: 7293497
    Abstract: A number of embodiments of a piston may have a shape that provides enhanced piston guidance. In such embodiments, the piston shape may include an axial profile that is configured to provide certain thrust load characteristics.
    Type: Grant
    Filed: November 3, 2005
    Date of Patent: November 13, 2007
    Assignee: Dresser, Inc.
    Inventor: Richard J. Donahue
  • Ice conveyor
    Patent number: 6276517
    Abstract: A series of regularly spaced cylindrical paddles are affixed to a steel strand cable. Each end of the cable is provided with a swaged ball shank which is pivotably received within a nut. The threaded nuts are connected by a threaded screw. The paddles are advanced on the cable through a conduit by a rotatable drive wheel. The system is thus adapted for moving ice cubes and chips. The drive wheel has eight teeth, each of which has a connector trough dimensioned to receive the connector assembly. Each tooth has a leading finger with a drive face which engages a paddle when it is received within a paddle trough defined between neighboring teeth. The drive face has a radially extending wall which engages the disk of the paddle, and a second radially extending wall spaced outwardly from the first which engages the protruding shoulder of the disk, such that the disks are always driven at two spaced locations.
    Type: Grant
    Filed: January 3, 2000
    Date of Patent: August 21, 2001
    Assignee: Protoco, Inc
    Inventors: Timothy G. Peterson, Richard J. Donahue, Craig H. Melter