Patents by Inventor Don P. S. Barker

Don P. S. Barker 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).

  • Dump block for dragline bucket
    Patent number: 4640496
    Abstract: A dump block is provided for a dragline bucket wherein a central cylinder is equipped with axially spaced side plates to provide a reeve-way for the dump rope, and a steel ring rotatably disposed about the cylinder having inner and outer plastic elements with the cylinder providing an oil reservoir for lubricating the inner plastic elements.
    Type: Grant
    Filed: April 4, 1985
    Date of Patent: February 3, 1987
    Assignee: ESCO Corporation
    Inventors: Robert L. Van Hoomissen, Terry L. Briscoe, Don P. S. Barker