Patents by Inventor Andreas Domsch

Andreas Domsch 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).

  • Flotation process for deinking printed waste paper
    Patent number: 4971656
    Abstract: A flotation process for the de-inking of printed waste-paper by treating the paper pulp in the pulper at alkaline pH-values by means of alkali silicate, oxidative bleaches and separating the loosened printing-ink particles from the fibrous material suspension by flotation, in which protein fatty acid condensates are added finely distributed, possibly together with dispersing agents, in a solution or dispersion which is fluid at normal temperature.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: November 20, 1990
    Assignee: Chemische Fabrik Gruenau GmbH
    Inventors: Klaus Lehmann, Andreas Domsch, Hans Hawel, Gregor Schuster
  • Process for deinking printed waste paper
    Patent number: 4959123
    Abstract: Process for deinking printed waste paper by treatment of the paper pulp in a pulper at alkaline pH values using alkali silicate, oxidative bleaches, higher fatty and/or resinic acids and dispersants and separation of the detached printing ink particles from the fiber suspension by flotation, the fatty and/or resinic acids being used in the form of their alkaline earth metal salts in fine distribution together with dispersants in an oil-in-water dispersion which is liquid at normal temperature.
    Type: Grant
    Filed: February 2, 1988
    Date of Patent: September 25, 1990
    Assignee: Chemische Fabrik Gruenau GmbH
    Inventors: Klaus Lehmann, Andreas Domsch, Hans Hawel