Patents by Inventor Wolfgang Christen

Wolfgang Christen 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).

  • Kneading disc for a screw extruder
    Patent number: 4215942
    Abstract: In order to improve the wear-resistance of highly stressed surfaces of a kneading disc in a helical extruding machine, the exposed tips of the kneading disc are provided with inserts of an extremely wear-resistant, hard material. In a variety of embodiments, the tips of the lenticular kneading disc are provided with bores and recesses for receiving the hard inserts. Advantageously, the recesses are cylindrical wells in which cylindrical inserts are soldered or cemented. The inserts may be made from hard metals or ceramics, for example tool steel or tungsten carbide or the like.
    Type: Grant
    Filed: October 17, 1978
    Date of Patent: August 5, 1980
    Assignee: Werner & Pfleiderer
    Inventors: Wilhelm Seufert, Gerhard Gnadig, Fritz Przybylla, Wolfgang Christen, Albert Grimminger