Patents Examined by Granger Theodore A.
  • Screen changer
    Patent number: 3962092
    Abstract: A simplified screen changer is provided which is particularly suitable for the extrusion of synthetic resinous thermoplastics. Screens are supported in a recessed movable plate. The screen on the upstream side is sealed against leakage by means of an extrusion pressure actuated sealing ring. The apparatus is of simple and rugged construction.
    Type: Grant
    Filed: January 10, 1975
    Date of Patent: June 8, 1976
    Assignee: The Dow Chemical Company
    Inventor: Ritchey O. Newman, Jr.