Patents by Inventor Herbert Gareis

Herbert Gareis 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).

  • Production of a silver halide emulsion
    Patent number: 4992362
    Abstract: The production of a photosensitive silver halide emulsion by precipitation of the silver halide in the presence of gelatine, flocculation and washing of the silver halide precipitated in the presence of the gelatine and redispersion with addition of more gelatine, precipitation being carried out in the presence of a gelatine having a gold number of at most 10 .mu.mol/g gelatine and a cysteine content of at most 6 ppm and redispersion being carried out with a gelatine having a gold number of at least 23 .mu.mol/g gelatine, leads to an emulsion of uniform grain distribution in which undesirably high fogging is avoided.
    Type: Grant
    Filed: August 4, 1989
    Date of Patent: February 12, 1991
    Assignee: AGFA Gevaert Aktiengesellschaft
    Inventors: Franz Moll, Bruno Mucke, Klaus Wagner, Herbert Gareis, Wolfgang Graesser, Peter Koepff