Patents by Inventor Hugo Fritschi

Hugo Fritschi 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 production of enantiomerically-pure azetidine-2-carboxylic acid
    Patent number: 5942630
    Abstract: The invention relates to a process for the production of enantiomerically-pure AzeOH which comprises selective crystallisation of a diastereomerically-pure tartrate salt thereof, followed by liberation of the free amino acid, as well as the compounds L-azetidine-2-carboxylic acid-D-tartrate and D-azetidine-2-carboxylic acid-L-tartrate.
    Type: Grant
    Filed: September 19, 1996
    Date of Patent: August 24, 1999
    Assignee: Astra AB
    Inventors: Philipp Barth, Hugo Fritschi, Jan-Erik Nystrom, Armin Pfenninger