Patents by Inventor Wilhelm Heffe

Wilhelm Heffe 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).

  • 4-(3.4-Methylene dioxy phenyl)-piperidines
    Patent number: 3982001
    Abstract: This invention provides new compounds of formula I, ##SPC1##wherein R.sub.1 and R.sub.2 are the same or different and are in each case hydrogen, halogen, lower alkyl, hydroxy or lower alkoxy R.sub.3 is hydrogen or lower acyl and A stands for groups of formula ##EQU1## wherein R.sub.5 and R.sub.6 are independently, hydrogen or methyl and n is 0, 1 or 2, useful as analgesic agents.
    Type: Grant
    Filed: September 19, 1974
    Date of Patent: September 21, 1976
    Assignee: Sandoz, Inc.
    Inventors: Wilhelm Heffe, Fritz Hunziker, Klaus Thoma