Patents by Inventor Juergen Dornhagen

Juergen Dornhagen 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).

  • Preparation of reactive phthalocyanine dyes
    Patent number: 5516901
    Abstract: Reactive phthalocyanine dyes are prepared by reacting phthalocyaninesulfonyl chlorides with amines containing a reactive group and subjecting the resulting reaction mixture to a membrane treatment.
    Type: Grant
    Filed: December 10, 1993
    Date of Patent: May 14, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Juergen Dornhagen, Manfred Patsch
  • Preparation of reactive phthalocyanine dyes
    Patent number: 5444163
    Abstract: There is described a process for preparing reactive phthalocyanine dyes with .beta.-substituted ethylsulfonyl or vinylsulfonyl groups by reacting a phthalocyaninesulfonyl chloride with amines with .beta.-substituted ethylsulfonyl or vinylsulfonyl groups with or without further amines in the presence of a heterocyclic catalyst.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: August 22, 1995
    Assignee: BASF Aktiengesellschaft
    Inventors: Juergen Dornhagen, Manfred Patsch