Patents Assigned to Western Litho Plate and Supply Company
  • Photographic printing apparatus
    Patent number: 4951089
    Abstract: Apparatus for selectively exposing photosensitized plates to light through films operable selectively in a first mode for exposing plates of single newspaper page size to light through films of such size, and in a second mode for exposing plates of double newspaper page size to light through films of such size, utilizing a first window frame with two single-page size windows therein in the first mode and a second window frame with a double-page size window therein in the second mode.
    Type: Grant
    Filed: June 9, 1989
    Date of Patent: August 21, 1990
    Assignee: Western Litho Plate and Supply Company
    Inventor: John W. Powers
  • Apparatus for exposing and conveying photosensitive plates
    Patent number: 4353647
    Abstract: Apparatus for exposing lithographic plates to light through a film, e.g. a negative, adapted for exposing a plurality of plates to light through the same film, having a conveyor with grippers for conveying a plate with a film thereon to an exposure station, where a window comes down on the film and plate, the grippers being opened to allow the window to vacuum-lift the film off the plate and retain it while another plate is conveyed to the exposure station for exposure through the retained film.
    Type: Grant
    Filed: January 8, 1981
    Date of Patent: October 12, 1982
    Assignee: Western Litho Plate & Supply Company
    Inventors: Robert E. Harrell, Tedd L. Harrell, Harold E. Coons, Jr.