Patents by Inventor Karl Werner

Karl Werner 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-aminoanthraquinone
    Patent number: 3933867
    Abstract: Process for the preparation of 1-aminoanthraquinone by reaction of 1-nitroanthraquinone with ammonia in organic solvents, characterised in that the reaction is carried out in ethers, aliphatic or cycloaliphatic hydrocarbons or optionally alkyl-substituted aromatic hydrocarbons.
    Type: Grant
    Filed: March 22, 1974
    Date of Patent: January 20, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl-Werner Thiem, Wolfgang Auge, Rutger Neeff
  • Process for the preparation of 1,5- and 1,8-diamino-anthraquinone
    Patent number: 3933868
    Abstract: Process for the preparation of 1,5- and/or 1,8-diaminoanthraquinone by reaction of 1,5- and/or 1,8-dinitroanthraquinone with ammonia in organic solvents, characterised in that the reaction is carried out in ethers, aliphatic or cycloaliphatic hydrocarbons or optionally alkyl-substituted aromatic hydrocarbons or in mixtures of these compounds.
    Type: Grant
    Filed: March 22, 1974
    Date of Patent: January 20, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl-Werner Thiem, Wolfgang Auge, Rutger Neeff, Heinz Scheiter
  • Process for the preparation of pure 1-nitroanthraquinone
    Patent number: 3931252
    Abstract: Process for the manufacture of pure 1-nitroanthraquinone, characterised in that a nitroanthraquinone mixture obtained by nitration of anthraquinone in the presence of inorganic acids and, optionally, lowering the molar fraction of the acids in the reaction mixture after isolation of the reaction products which have precipitated and, optionally, further measures, is subjected to a rectification.
    Type: Grant
    Filed: November 16, 1973
    Date of Patent: January 6, 1976
    Assignee: Bayer Aktiengesellschaft
    Inventors: Wolfgang Auge, Bernd Thelen, Karl-Werner Thiem, Rutger Neeff