Patents by Inventor Karsten Krohn

Karsten Krohn 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 synthesis of L-alpha-amino acids
    Patent number: 5108914
    Abstract: Microorganisms with the ability to cleave enantioselectively 5-substituted hydantoins to L-alpha-amino acids are cultivated in a known manner in a batch preparation. By one-time dosage of anondegradable enzyme inductor of the structure ##STR1## (where R.sub.1, R.sub.2 and X are specifically defined) an increased enzyme activity combined with an increased reaction rate is achieved.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: April 28, 1992
    Assignee: Rutgerswerke Aktiengesellschaft
    Inventors: Fritz Wagner, Christoph Syldalk, Vera Mackowiak, Karsten Krohn, Hartmut Hoke, Albrecht Laufer
  • Process for the preparation of anthracyclinones
    Patent number: 4613464
    Abstract: The present invention relates to a new process for the preparation of anthracyclinones of the formula ##STR1## in which R denotes C.sub.1 -C.sub.4 -alkyl, R.sub.1 denotes H or OH, and R.sub.2 and R.sub.3 are different and each represent H or OH, and R.sub.4 and R.sub.5 are different and each represent H or OH, starting from a compound of the formula ##STR2## in which R.sub.1 and R have the abovementioned meaning. The compounds of the formula I are valuable intermediates in the preparation of the corresponding glycosides having cytostatic efficacy.
    Type: Grant
    Filed: August 10, 1984
    Date of Patent: September 23, 1986
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karsten Krohn, Bert Behnke