Patents by Inventor Francois L. Bercher

Francois L. Bercher has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • 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