Patents by Inventor Armin Lieberam

Armin Lieberam 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).

  • Process for the preparation of halogenoanthraquinones
    Patent number: 4006171
    Abstract: A process for the preparation of a chloroanthraquinone or a bromoanthraquinone comprising treating a molten mixture of at least one nitroanthraquinone and diluent with halogen at a temperature of about 180 to 300.degree. C, the diluent being present in at least about 10% by weight of the mixture and comprising at least one chloroanthraquinone or bromoanthraquinone. The diluent may correspond to the halogenoanthraquinone obtained from the nitroanthraquinone by replacement of the nitro group. A portion of the product can be recycled as diluent for further reaction.
    Type: Grant
    Filed: October 24, 1975
    Date of Patent: February 1, 1977
    Assignee: Bayer Aktiengesellschaft
    Inventors: Norbert Majer, Hans-Samuel Bien, Helmut Judat, Armin Lieberam