Patents by Inventor Johannes Kanellakopoulos

Johannes Kanellakopoulos 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-alkyl-pyrazole-5-carboxylic acid esters
    Patent number: 5977378
    Abstract: 1-alkyl-pyrazole-5-carboxylic acid esters are prepared by reacting the enolate of a 2,4-diketocarboxylic acid ester with an N-alkylhydrazinium salt in the presence of a solvent. This process allows a particularly economic preparation of 1-alkyl-pyrazole-5-carboxylic acid esters in a simple manner and with only little formation of undesirable isomers.
    Type: Grant
    Filed: January 8, 1998
    Date of Patent: November 2, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Nikolaus Muller, Lutz Heuer, Johannes Kanellakopoulos, Andreas Sattler, Klaus-Peter Heise