Patents Assigned to C. A. Parshall, Inc.
  • Endless film cartridge and pressure support plate therefor
    Patent number: 4613220
    Abstract: A film cartridge is provided to hold an endless film strip for storage and display. The cartridge includes a pressure support plate to hold the film in a focus plane for projection, which plate is a resilient, generally ellipsoidal loop with a front projection opening and means for securing the loop to the cartridge in a position to resiliently and uniformly press against the perimeter of the front opening in the cartridge to thereby guide and control motion of the film strip.
    Type: Grant
    Filed: October 9, 1984
    Date of Patent: September 23, 1986
    Assignee: C. A. Parshall, Inc.
    Inventor: Leon M. Levy