Patents by Inventor Walter Kartman

Walter Kartman 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).

  • Mold for thermoforming plastic sheet material
    Patent number: 3932096
    Abstract: A molding apparatus for thermoforming plastic sheet material having upper and lower matching molding blocks, each molding block having a thin rigid shell. The shell has a die cavity therein with the exposed face of the shell defining the die cavity surface. A porous body of metallic filler material is contained within the central portion of each molding block and is in contact with the inner surface of the rigid shell. Inlet and outlet means are provided for circulating a coolant fluid through the central portion of each molding block.
    Type: Grant
    Filed: June 10, 1974
    Date of Patent: January 13, 1976
    Inventor: Walter Kartman