Patents by Inventor Wilhelm Wullscheidt

Wilhelm Wullscheidt 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).

  • Pitch from coal tar pitch, method of its production, as well as application of such pitch material
    Patent number: 5128021
    Abstract: A novel pitch material made from coal tar pitch has:a) mesophase content of .ltoreq.2%,b) content of toluene-insolubles (.beta.-resin) between 58 and 75%,c) content of quinoline-insolubles of <2%,d) softening point in the 200.degree. to 300.degree. C. range, according to the Kramer-Sarnow (KS) measurement,e) content of volatile matter .ltoreq.20% andf) ash content of .ltoreq.0.06%.The pitch material of high coke yield (80 to beyond 90%) is suitable for the manufacture of molded carbonaceous shapes of high quality and of pitch coke. A further application would be as impregnation agent or bind. The method of making new pitch uses hot filtration in the presence of a filtration and followed by thin-film evaporation.
    Type: Grant
    Filed: August 3, 1989
    Date of Patent: July 7, 1992
    Assignees: Bergwerksverband GmbH, Didier Engineering GmbH
    Inventors: Ingo Romey, Rudolf Geier, Rolf H. Joest, Wilhelm Wullscheidt