Patents by Inventor Karl Zickgraf

Karl Zickgraf 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).

  • Autoclave for carrying out of material conversions under high temperatures and high pressures
    Patent number: 4201745
    Abstract: A digester vessel for containing material to be subjected to a high temperature pulsating high pressure process with an inner tubular enclosing metal wall of a helically corrugated sheet material forming a chamber thereon, an outer containing tubular wall, and an intermediate layer of stacked ceramic material with a vent opening through the outer wall, mold bodies fitting the corrugation spaces between the inner wall and the intermediate layer, corrugated flanges at the ends of the inner wall welded to the outer wall, and an end closure for the chamber having a flange meeting a flange of the outer wall with a packing therebetween.
    Type: Grant
    Filed: March 6, 1978
    Date of Patent: May 6, 1980
    Assignee: Klockner-Humboldt-Deutz Aktiengesellschaft
    Inventor: Karl Zickgraf