Patents by Inventor Karl M. Williamson

Karl M. Williamson 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).

  • Self-cleaning grate assembly
    Patent number: 4966689
    Abstract: The apparatus includes a housing having an inlet for coal and the like and two outlets, a sizing grate, a comb, and means for moving the comb relative to the grate for dislodging granular material clogged therein. The grate is affixed to the housing and provides a plurality of openings which are sized to allow granular material of a predetermined size to pass therethrough to the first outlet, while granular material of a greater size is the second outlet to a crusher. The invention also includes a method of automatically sizing granular material using a self-cleaning grate assembly.
    Type: Grant
    Filed: January 13, 1989
    Date of Patent: October 30, 1990
    Inventors: Rick Wark, Philip H. Christos, Karl M. Williamson