Patents by Inventor Maurice Rothwell

Maurice Rothwell 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).

  • Mixing and venting extruder
    Patent number: 4004787
    Abstract: An extrusion apparatus for use with thermoplastic materials has a withdrawable rotor which is mounted on a piston motivated carriage, the carriage having anti-vibration mounting members to reduce loads on the rotor. A gaseous vent chamber is operable in conjunction with a reversible extruder screw and a waste mix ejection arrangement, to prevent undesirable contamination or incompletely mixed material from the extruded product.
    Type: Grant
    Filed: January 8, 1976
    Date of Patent: January 25, 1977
    Assignee: USM Corporation
    Inventors: Henry Ellwood, Maurice Rothwell