Patents by Inventor Andreas Gappisch

Andreas Gappisch 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 crystallizing N-(4-trifluoromethylphenyl)-5-methylisoxazole-4-carboxamide
    Patent number: 6303792
    Abstract: The invention relates to a process for obtaining N-(4-trifluoromethylphenyl)-5-methyl-isoxazole-4-carboxamide in crystalline form, which is essentially free of byproducts. For this purpose, N-(4-trifluoromethylphenyl)-5-methylisoxazole-4-carboxamide is transferred into an organic solvent or into mixtures of organic solvents and water, the amount of byproduct in the solution is determined by quantitative analysis and an equimolar amount of a base is added. N-(4-Trifluoromethylphenyl)-5-methyl-isoxazole-4-carboxamide is isolated from the resulting solution by crystallization.
    Type: Grant
    Filed: February 22, 2000
    Date of Patent: October 16, 2001
    Assignee: Aventis Pharma Deutschland GmbH
    Inventors: Hans-Hermann Lau, Udo Hedtmann, Holger Faasch, Andreas Gappisch