Patents by Inventor Harold O. Hilfiker, deceased

Harold O. Hilfiker, deceased 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).

  • Retaining wall for earthen formations and method of making the same
    Patent number: 4391557
    Abstract: An earthen formation is retained by welded wire trays embedded in the formation to effect its reinforcement. A concrete face panel is cast in place at the face of the formation and reinforced by upturned ends on the trays.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: July 5, 1983
    Assignee: Hilfiker Pipe Co.
    Inventors: William K. Hilfiker, Harold O. Hilfiker, deceased, William B. Hilfiker