Patents by Inventor Heinz Scheiter

Heinz Scheiter 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 1,4-diamino-2,3-dicyano-anthraquinones
    Patent number: 4294769
    Abstract: 2,3-Dicyano-anthraquinones of the formula ##STR1## wherein R denotes hydrogen, alkyl or cycloalkyl, are obtained in good yields and high purity by reacting compounds of the formula ##STR2## wherein X denoted hydrogen or the sulphonic acid group, with cyanides in formamide or N-methylformamide as solvents, and if appropriate oxidizing agents and heavy metal catalysts.
    Type: Grant
    Filed: July 24, 1980
    Date of Patent: October 13, 1981
    Assignee: Bayer Aktiengesellschaft
    Inventors: Friedrich W. Krock, Rutger Neeff, Heinz Scheiter
  • 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