Patents Assigned to Ludwig Wittrock
  • Apparatus for working plastic materials
    Patent number: 3977658
    Abstract: Apparatus for the working of plastic materials, including three separate portions consisting of two screw pumps between which lies a conical kneading rotor having radical fingers and rotating in a cylindrical housing.
    Type: Grant
    Filed: February 25, 1975
    Date of Patent: August 31, 1976
    Assignee: Ludwig Wittrock
    Inventors: Ludwig Wittrock, Heinz Brand, Helmut Konig