Patents by Inventor Rudolf Tromnau

Rudolf Tromnau 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).

  • Patent number: 5756268
    Abstract: If a color photographic material, which is processed by the process steps a) image-by-image exposure, b) color developing, c) bleaching, d) fixing, e) washing or stabilizing, and f) drying, wherein steps c) and d) may be combined to constitute bleach-fixing, is subjected to a temperature treatment of 0.01 to 30 seconds at 60 to 240.degree. C. between exposure and color developing, an increase of the contrast can thereby be obtained.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: May 26, 1998
    Assignee: Agfa-Gevaert AG
    Inventors: Edgar Draber, Rudolf Tromnau, Manfred Peters
  • Patent number: 5021326
    Abstract: A process for processing a color photography silver halide recording material by development, bleach-fixing and stabilization or washing, wherein the silver halide emulsion layers of the photographic material have a chloride content of at least 80 mol %, the total processing time is not more than 60 seconds, the concentration of halide in the developing bath in the use state does not exceed 10.sup.-2 mol/l, the chloride content of the halide in the developing bath being at least 80 mol %, and the processing baths are replenished during continuous operation, provides results of good quality such as are otherwise obtained only by processing over a total period of at least 180 seconds.
    Type: Grant
    Filed: April 4, 1990
    Date of Patent: June 4, 1991
    Assignee: Agfa Gevaert Aktiengesellschaft
    Inventors: Heinz Meckl, Karl-Heinz Reuter, Rudolf Tromnau
  • Patent number: 4906560
    Abstract: In order to be able to cast additional layers on auxiliary layers of photographic materials immediately after the latter have been cast without encountering any difficulties as regards uniformity of the cast layer and wet adherence due to incomplete conversion of the gelatine from the sol to the gel form, the auxiliary layer must contain an effective quantity of at least one compound obtained by the reaction of trihydric to hexahydric alcohols with propylene oxide.
    Type: Grant
    Filed: October 11, 1988
    Date of Patent: March 6, 1990
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Fritz Nittel, Wolfgang Himmelmann, Rudolf Tromnau, Erich Muller