Patents by Inventor Howard H. Hilshorst

Howard H. Hilshorst 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).

  • Pavement planing device
    Patent number: 4366991
    Abstract: A pavement planing device including a rotating wheel on which a plurality of cutter holders are pivotally mounted. Restraining stop members mounted on the wheel limit outward swinging of the cutter holders as the wheel is rotated. Retraction stop members mounted on the wheel are engaged by the cutter holder members as they swing backwardly following impact with the surface of the pavement. The cutter holder members can rebound from the retraction stop members to cause multiple tool impacts by each cutter holder during a single pass on the surface being cut.
    Type: Grant
    Filed: February 2, 1981
    Date of Patent: January 4, 1983
    Inventor: Howard H. Hilshorst
  • Pavement planing device
    Patent number: 4332422
    Abstract: A pavement planing device including a rotating wheel on which cutter holders are pivotally mounted. A restraining stop member mounted on the wheel restrains outward swinging of the cutter holders as the wheel is rotated. Retraction stop members mounted on the wheel are engaged by the cutter holder members as they swing backwardly following impact with the surface of the pavement. The cutter holder members rebound from the retraction stop members to cause multiple tool impacts on the surface.
    Type: Grant
    Filed: August 14, 1975
    Date of Patent: June 1, 1982
    Inventor: Howard H. Hilshorst