Patents by Inventor Helmut Koller

Helmut Koller 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(R)-2-bromo-3-phenyl -propionic acid
    Publication number: 20030125575
    Abstract: Process for the preparation of (R)-2-bromo-3-phenylpropionic acid starting from D-phenylalanine, sodium nitrite and HBr in an aqueous solution, the reaction being carried out in the presence of a bromide salt, at a temperature between −10 and 30° C.
    Type: Application
    Filed: November 14, 2002
    Publication date: July 3, 2003
    Inventors: Franciscus Alphons Marie Lommen, Helmut Koller, Herbert Scherubl
  • Method for the preparation of (s) -2-acetylthio-3-phenylpropionic acid
    Publication number: 20030120102
    Abstract: Method for the preparation of (S)-2-acetylthio-3-phenylpropionic acid, wherein (R)-2-bromo-3-phenylpropionic acid is contacted with thioacetic acid and an organic base, for example triethylamine. Preferably the base is metered to a mixture of (R)-2-bromo-3-phenylproprionic acid and thioacetic acid at a temperature between −10° C. and +30° C.
    Type: Application
    Filed: December 2, 2002
    Publication date: June 26, 2003
    Inventors: Franciscus Alphons Marie Lommen, Helmut Koller, Herbert Scherubl