Patents by Inventor Petra Bien, heir

Petra Bien, heir 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 1-acylamino-5(8)-chloroanthraquinones
    Patent number: 4179450
    Abstract: The invention relates to a novel process for the preparation of 1-acylamino-5(8)-chloroanthraquinones, which are starting materials for the preparation of vat dyes. It is characterized in that 1,5(8)-dichloroanthraquinones is reacted with ammonia at temperatures of 190.degree. to 240.degree. C., the amino groups in the reaction mixture are completely acylated and the more sparingly soluble diacylaminoanthraquinone is separated off from the more readily soluble monoacylaminochloroanthraquinone.The new process yields reaction products which are purer and cheaper than those which are obtained by conventional methods. Moreover there are smaller waste water problems.
    Type: Grant
    Filed: May 5, 1977
    Date of Patent: December 18, 1979
    Assignee: Bayer Aktiengesellschaft
    Inventors: Detlef-Ingo Schutze, Hans-Samuel Bien, deceased, Petra Bien, heir, Daniel Bien, heir