Patents by Inventor Durward Rutledge

Durward Rutledge 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).

  • Rotary extruder with a gear pump
    Patent number: 4813863
    Abstract: Rotary extruder apparatus is provided comprising housing (22), recess (29) within housing (22), cylindrical rotor (30) rotatably mounted within recess (29) in housing (22), feed inlet (25), discharge outlet (52) providing fluid communication between recess (29) and diehead (26), in combination with gear pump (160) adapted to increase the pressure of material received from discharge outlet (52). Knurled rotor (30), undercut feed inlet (25), segmented rotor shafts (18, 18'), thrust rings (109, 109') made of dissimilar metals, and circumferentially spaced cartridge heaters (63) in housing (22) are also disclosed.
    Type: Grant
    Filed: February 21, 1986
    Date of Patent: March 21, 1989
    Assignee: Permian Research Corporation
    Inventors: Granville J. Hahn, Raleigh N. Rutledge, Durward Rutledge