Patents by Inventor Manfred Hauptreif

Manfred Hauptreif 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).

  • Brightener mixtures based on bisstyryl compounds
    Patent number: 5695686
    Abstract: Brightener mixtures containing from 75% by weight to 100% by weight, based on the weight of the mixture, of the bisstyryl compounds of the formulae I and II ##STR1## in a weight ratio from 10:90 to 70:30, formulations containing the novel mixtures, and also their use for optically brightening synthetic, semisynthetic or natural polymer materials.
    Type: Grant
    Filed: March 13, 1996
    Date of Patent: December 9, 1997
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Hauptreif, Norbert Leppert, Karl-Heinz Etzbach, Helmut Reichelt, Peter Raatz, Manfred Herrmann
  • Preparation of N,N-disubstituted m-aminophenols
    Patent number: 5245081
    Abstract: The preparation of N,N-disubstituted m-aminophenols from resorcinol, which is reacted, in a first step, with primary amines to form N-monosubstituted m-aminophenols, which are treated in situ, in a second step, with alkylating agents to form N,N-disubstituted m-aminophenols.
    Type: Grant
    Filed: May 22, 1992
    Date of Patent: September 14, 1993
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Hauptreif, Helmut Reichelt