Patents by Inventor Matthias Porger

Matthias Porger 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 developer concentrate
    Patent number: 6468724
    Abstract: A two-part color photographic developer concentrate in which part 1 contains at least one antioxidant selected from the group consisting of diethylhydroxylamine and diethylhydroxylamine disulfo acid, at least one auxiliary solvent, at least one optical brightener and at least one color developer substance and part 2 contains at least one buffer substance, alkali and at least one water softener, may be produced by part 1 additionally containing 0.001 to 1 mol of hydroxylamine or a monoalkylated hydroxylamine or the salts thereof per liter of concentrate concentrate and at least 20% by weight of the total of part 1 being water.
    Type: Grant
    Filed: June 7, 2001
    Date of Patent: October 22, 2002
    Assignee: Agfa-Gevaert
    Inventors: Gustav Tappe, Matthias Porger
  • Colour photographic developer concentrate
    Publication number: 20010036605
    Abstract: A two-part color photographic developer concentrate in which part 1 contains at least one antioxidant selected from the group consisting of diethylhydroxylamine and diethylhydroxylamine disulfo acid, at least one auxiliary solvent, at least one optical brightener and at least one color developer substance and part 2 contains at least one buffer substance, alkali and at least one water softener, may be produced by part 1 additionally containing 0.001 to 1 mol of hydroxylamine or a monoalkylated hydroxylamine or the salts thereof per liter of concentrate concentrate and at least 20% by weight of the total of part 1 being water.
    Type: Application
    Filed: June 7, 2001
    Publication date: November 1, 2001
    Inventors: Gustav Tappe, Matthias Porger