Patents by Inventor Stephen R. Butts

Stephen R. Butts 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).

  • Vertical shaft impact crusher with interchangeable crusher ring segments
    Patent number: 4756484
    Abstract: A vertical shaft impact crusher is provided comprising a housing, a rotor mounted within the housing for rotation about a vertical axis and propelling incoming rock outwardly against a crusher ring, wherein the crusher ring is comprised of segments each capable of autogenous, impact or semi-autogenous crushing or combinations thereof in order to precisely control the size and shape of crushed products.
    Type: Grant
    Filed: August 10, 1987
    Date of Patent: July 12, 1988
    Assignee: Nordberg, Inc.
    Inventors: David J. Bechler, Stephen R. Butts