Patents Issued in May 13, 1977
  • Process and device for the photographic reproduction of diapositives
    Patent number: 4021831
    Abstract: A process and device for the photographic reproduction of diapositives whereby during exposure of a film to light from an illuminated diapositive, the film is simultaneously partially fogged by diffuse light reaching the said film directly and without passing through the diapositive.
    Type: Grant
    Filed: December 13, 1974
    Date of Patent: May 13, 1977
    Assignee: Elinca S.A.
    Inventor: Francois L. Bercher