Patents by Inventor hlschlager

hlschlager 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).

  • Stabilization of a photographically produced silver image
    Patent number: 4886737
    Abstract: Photographically produced black and white images (silver images) are stabilized against subsequent destruction of the image silver, in particular due to discoloration, by treating the finished silver image with an aqueous after treatment bath containing aminotetrazole or a mercaptotetrahydrotriazine.
    Type: Grant
    Filed: September 19, 1988
    Date of Patent: December 12, 1989
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Werner Berthold, Paul Marx, hlschlager