Patents by Inventor Walter D. Fish

Walter D. Fish 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).

  • Pneumatic rock drill with peripheral piston clearance space
    Patent number: 3991835
    Abstract: A fluid operated reciprocating piston rock drill wherein the piston has a stem portion closely slidably received in a guide bushing and the cylinder of the rock drill provides clearance space around the head of the piston.
    Type: Grant
    Filed: December 11, 1974
    Date of Patent: November 16, 1976
    Assignee: Joy Manufacturing Company
    Inventors: Edward A. Bailey, Walter D. Fish