Patents by Inventor Gabriele Bien

Gabriele Bien 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).

  • Antraquinone dyestuffs
    Patent number: 4105662
    Abstract: Reactive dyestuffs of the formula ##STR1## WHEREIN R.sub.1, R.sub.2, R.sub.3, X, Y and Z have the meaning given in the description and their use for the dyeing and printing of materials which contain hydroxyl groups and materials which contain N, such as cotton, wool and the like, by the customary processes.
    Type: Grant
    Filed: March 9, 1977
    Date of Patent: August 8, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Klaus von Oertzen, Hans Samuel Bien, deceased, by Gabriele Bien, legal representative
  • Preparation of aminoanthraquinones from nitroanthraquinones
    Patent number: 4076736
    Abstract: In the reaction of a nitroanthraquinone with ammonia in a solvent at elevated temperature to produce the corresponding aminoanthraquinone, the improvement which comprises effecting the reaction in the presence of an ammonium halide. Advantageously, the nitroanthraquinone is an .alpha.-nitroanthraquinone, the ammonium halide is at least one of ammonium chloride and ammonium bromide, and the solvent comprises at least one member selected from the group consisting of water, nitrobenzene, a glycol, an acid amide and sulfolane.
    Type: Grant
    Filed: June 4, 1976
    Date of Patent: February 28, 1978
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl-Julius Reubke, Hans-Samuel Bien, deceased, Gabriele Bien, Dorothee Bien