Patents Assigned to Plastonium, Inc.
  • Preparation of heat barrier materials
    Patent number: 3944685
    Abstract: Heat barrier materials are prepared by forming an intimate admixture of alkaline earth sulfate and finely divided carbonaceous material into a shaped composition and subjecting said shaped composition to a high temperature to cause a surface reaction to produce a coating comprising alkaline earth sulfide on the surface of said shaped composition.
    Type: Grant
    Filed: June 28, 1971
    Date of Patent: March 16, 1976
    Assignee: Plastonium, Inc.
    Inventor: Rudy W. Gunnerman