Patents by Inventor Alfred Schuhmacher

Alfred Schuhmacher 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).

  • Acylation of aromatics
    Patent number: 4895984
    Abstract: Aromatics are acylated by the Friedel-Crafts method by carrying out the acylation in the presence of metalalkyls or metalalkyl halides of metals or semimetals of main groups two to five and/or of metals of subgroups two or four of the Periodic Table.
    Type: Grant
    Filed: May 25, 1988
    Date of Patent: January 23, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Eggersdorfer, Hardo Siegel, Alfred Schuhmacher, Walter Grosch, Jochem Henkelmann
  • Preparation of alkyl-substituted aromatic ketones
    Patent number: 4853481
    Abstract: Alkyl-substituted aromatic ketones are prepared by reacting alkylbenzenes with carboxylic anhydrides in the presence of a Friedel-Crafts catalyst by performing the reaction in the presence of a tertiary amine or diamine.
    Type: Grant
    Filed: November 30, 1987
    Date of Patent: August 1, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Jochem Henkelmann, Manfred Eggersdorfer, Walter Grosch, Alfred Schuhmacher, Hardo Siegel
  • Manufacture of Bz-1-bromobenzanthrone
    Patent number: 4146547
    Abstract: A process for the manufacture of Bz-1-bromobenzanthrone by brominating finely divided benzanthrone in aqueous suspension, wherein the improvement comprises treating benzanthrone having a mean particle size of 30 .mu.m or less with bromine or brominating agent at above 80.degree. C.A product which contains from 91 to 94% by weight of Bz-1-bromobenzanthrone is obtained.
    Type: Grant
    Filed: June 30, 1977
    Date of Patent: March 27, 1979
    Assignee: BASF Aktiengesellschaft
    Inventors: Alfred Schuhmacher, Karl-Erich Kling
  • Direct production of 1,9-anthrapyrimidine-2-carboxylic acid-1, anthraquinonylamide in pigmentary form
    Patent number: 3933821
    Abstract: Direct production of 1,9-anthrapyrimidine-2-carboxylic acid-1'-anthraquinonylamide in pigmentary form by reaction of 1,9-anthrapyrimidine-2-carboxylic acid chloride with 1-amino-anthraquinone in a polar water-miscible aprotic solvent. The dye is obtained in a high yield and in a very finely divided and pure form. The isolated reaction product may be used direct as a pigment.
    Type: Grant
    Filed: December 19, 1973
    Date of Patent: January 20, 1976
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinrich Hiller, Wolfgang Jentzsch, Alfred Schuhmacher