Patents by Inventor Peter Burckhardt

Peter Burckhardt 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).

  • Substituted N-benzoyl-N'-(2-phenylethyl)-piperazines
    Patent number: 5321027
    Abstract: N-Benzoyl-N'-(2-phenylethyl)-piperazines of formula I ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 have the meanings as defined in the specification, and salts thereof, have analgesic properties and can be used as analgesic active ingredients in medicaments. They are prepared, for example, as follows: a compound of formula II ##STR2## wherein X.sub.1 is carboxy or reactive functionally modified carboxy, or a salt thereof, is reacted with a compound of formula III ##STR3## wherein X.sub.2 is hydrogen.
    Type: Grant
    Filed: February 22, 1993
    Date of Patent: June 14, 1994
    Assignee: Ciba-Geigy Corporation
    Inventors: Pier G. Ferrini, Peter Burckhardt