Patents by Inventor Herbert Mollet

Herbert Mollet 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 for the production of negative color images by the silver dye bleach process, and the silver dye bleach material used in this process
    Patent number: 4374914
    Abstract: Negative color images are produced by the silver dye bleach process, by exposure of a photographic silver dye bleach material, silver developing, dye bleaching, silver bleaching and fixing, the silver bleaching being optionally carried out simultaneously with the dye bleaching and/or the fixing, in a single treatment bath.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: February 22, 1983
    Assignee: Ciba-Geigy Ltd.
    Inventors: Herbert Mollet, Dieter Wyrsch
  • Process for production of masked positive color images by the silver dye bleach process and the silver dye bleach material used in this process
    Patent number: 4368256
    Abstract: Production of masked positive color images by the silver dye bleach process, by exposure of a photographic material for the silver dye bleach process, silver developing, dye bleaching, silver bleaching and fixing, optionally the silver bleaching is carried out simultaneously with the dye bleaching and/or the fixing, in a single processing bath.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: January 11, 1983
    Assignee: Ciba-Geigy AG
    Inventors: Herbert Mollet, Dieter Wyrsch
  • Process for the production of masked positive color images by the silver dye bleach process
    Patent number: 4310617
    Abstract: Production of masked positive color images by the silver dye bleach process, by exposing a photographic material for the silver dye bleach process, silver developing, dye-bleaching, silver-bleaching and fixing, optionally, the step of silver-bleaching is carried out in a combined treatment bath together with dye-bleaching and/or fixing.
    Type: Grant
    Filed: August 1, 1980
    Date of Patent: January 12, 1982
    Assignee: Ciba-Geigy AG
    Inventors: Herbert Mollet, Alfred Oetiker, Carlo Boragine
  • Method of processing silver dye bleaching materials and preparations suitable for the dye and silver bleaching
    Patent number: 4125402
    Abstract: A method of processing silver dye bleaching materials is provided wherein a combined aqueous dye and silver bleaching bath is used which contains a strong acid, a water-soluble iodide, a dye bleaching catalyst, a water-soluble oxidant and an antioxidizing agent, wherein the antioxidizing agent is an alkali metal, alkaline earth metal or ammonium bisulphite adduct of an organic carbonyl compound. The dye and silver bleaching can also be carried out in separate baths and then the aqueous dye bleaching bath contains a strong acid, a water-soluble iodide, a dye bleaching catalyst and the antioxidizing agent, which is again said bisulphite adduct. The strongly acid baths which contain as antioxidizing agents the bisulphite adducts are stable over a lengthy period of time, exert a lasting antioxidizing action and are free of offensive odors.
    Type: Grant
    Filed: August 12, 1977
    Date of Patent: November 14, 1978
    Assignee: Ciba-Geigy AG
    Inventor: Herbert Mollet
  • Method for processing silver dye bleach materials
    Patent number: 3963492
    Abstract: The present invention relates to a simplified method for processing silver dye bleach material by (1) silver developing, (2) dye and silver bleaching (3) silver fixing and (4) soaking. The sequence (1), (2), (3), (4) is followed and the bleaching bath (2) contains (a) a strong acid, (b) a water-soluble iodide, (c) a water-soluble oxidizing agent (d) an antioxidant and (e) a dye bleach catalyst.
    Type: Grant
    Filed: October 1, 1974
    Date of Patent: June 15, 1976
    Assignee: Ciba-Geigy AG
    Inventors: Max Marthaler, Matthias Schellenberg, Herbert Mollet, Christoph Chylewski