Patents by Inventor Harold W. Powell

Harold W. Powell 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).

  • Hydraulic snubber for grapple and method
    Patent number: 4810020
    Abstract: A hydraulic snubber for a skidding grapple employing an internal piston, the piston having associated therewith a line type seal to prevent leakage of pressure fluid against a friction disc and wherein the passage providing pressure fluid to the piston is equipped with a special fitting to prevent overload.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: March 7, 1989
    Assignee: Esco Corporation
    Inventor: Harold W. Powell