Patents by Inventor Gunther Helling

Gunther Helling 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).

  • Color photographic silver halide material
    Patent number: 6468728
    Abstract: A color photographic material comprising a support, at least one light-sensitive silver halide emulsion layer and at least one color coupler associated with said layer, characterized in that the material contains at least one compound of formula R1—SO2—NH—CO—R2  (I) wherein R1 and R2 denote organic radicals, the N atom can also be deprotonated, and compound I is substantially colorless and does not couple to form colored compounds during the processing of the material, is distinguished by its steep gradation and in that a high color density is obtained with inexpensive compounds.
    Type: Grant
    Filed: June 22, 2001
    Date of Patent: October 22, 2002
    Assignee: Agfa-Gevaert
    Inventor: Günther Helling
  • Colour photographic silver halide material
    Publication number: 20020022202
    Abstract: A colour photographic material comprising a support, at least one light-sensitive silver halide emulsion layer and at least one colour coupler associated with said layer, characterised in that the material contains at least one compound of formula
    Type: Application
    Filed: June 22, 2001
    Publication date: February 21, 2002
    Inventor: Gunther Helling