Patents Assigned to First-Sha Co., Ltd.
  • Method for treating printed paper sheets for illuminated display
    Patent number: 4016309
    Abstract: There is described a method for treating a paper sheet which bears on one side a printed picture image for illuminated display on a light box, wherein a treating liquid is applied on the non-printed back side of the paper sheet to impregnate liquid paraffin into the sheet to increase its light transmittivity and the sharpness of the picture image.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: April 5, 1977
    Assignee: First-Sha Co., Ltd.
    Inventor: Hirokazu Itoh