Patents by Inventor Harold O. Hilfiker

Harold O. Hilfiker 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).

  • 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
  • Patent number: 4329089
    Abstract: A retaining structure for an earthen formation wherein spaced anchor members in the form of rock anchors or gridwork mats are embedded in the formation and wire retainers are secured between the anchor members. The retainers comprise primary retention rods secured to the anchors and secondary retention members secured to the rods to span the space between adjacent anchor members. In certain embodiments the anchors are provided with extensions to support form panels in spaced relationship to the secondary retention members and a concrete wall is formed in place between said panels and the secondary retention members.
    Type: Grant
    Filed: July 12, 1979
    Date of Patent: May 11, 1982
    Assignee: Hilfiker Pipe Company
    Inventors: William K. Hilfiker, Harold O. Hilfiker, William B. Hilfiker
  • Patent number: 4324508
    Abstract: An earthen formation is reinforced against slippage by embedding welded wire grid work mats within the formation and securing the mats to precast elongate panels disposed at the face of the formation. The mats serve as anchors for the panels, as well as reinforcing means for the formation. Plural connections secure the mats along the length of at least certain of the panels.
    Type: Grant
    Filed: January 9, 1980
    Date of Patent: April 13, 1982
    Assignee: Hilfiker Pipe Co.
    Inventors: William K. Hilfiker, Harold O. Hilfiker, William B. Hilfiker