Patents Assigned to John Fairfax & Sons Limited
  • Printing plate inspection apparatus
    Patent number: 4149187
    Abstract: A printing plate inspection apparatus for inspecting the dot profile of photo-engraved printing plates having a length of opaque material having a straight edge which is placed adjacent the surface to be inspected with a light source to light the surface on one side of the straight edge, and a viewing device on the other side of the straight edge to receive the light reflected from the surface under the straight edge to determine the dot profile.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: April 10, 1979
    Assignee: John Fairfax & Sons Limited
    Inventors: Archibald E. Palmer, Raymond G. Macquart, Risto T. T. Karaiste