Patents by Inventor Gunther Pietsch

Gunther Pietsch 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: 4748146
    Abstract: The invention relates to a process for encapsulating solutions of reactants of color reaction systems by means of conventional encapsulation processes, the reactant initially being dissolved in a solvent with a good dissolving power and immediately prior to emulsification or encapsulation, a non-solvent, which only dissolves the reactant to an insignificant extent, is admixed with the fresh solution obtained in a quantity which adjusts a supersaturated system, the capsules obtainable as a result thereof, as well as their use with an encapsulated solution of a basic color former, which supplies a color by the reaction with acid reactants, in non-carbon paper.
    Type: Grant
    Filed: May 15, 1987
    Date of Patent: May 31, 1988
    Assignee: Papierfabrik August Koehler AG
    Inventors: Gunther Pietsch, Claus Hartmann
  • Patent number: 4684574
    Abstract: The invention relates to a process for encapsulating solutions of reactants of color reaction systems by means of conventional encapsulation processes, the reactant initially being dissolved in a solvent with a good dissolving power and immediately prior to emulsification or encapsulation, a non-solvent, which only dissolves the reactant to an insignificant extent, is admixed with the fresh solution obtained in a quantity which adjusts a supersaturated system, the capsulates obtainable as a result thereof, as well as their use with an encapsulated solution of a basic color former, which supplies a color by the reaction with acid reactants, in non-carbon paper.
    Type: Grant
    Filed: March 5, 1985
    Date of Patent: August 4, 1987
    Assignee: Papierfabrik August Koehler AG
    Inventors: Gunther Pietsch, Claus Hartmann