Patents by Inventor Marcel Scheer

Marcel Scheer 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 l-dopa
    Patent number: 3969397
    Abstract: The present invention is directed to preparing L-Dopa, an agent effective in the treatment of Parkinson's Disease, from a D,L-N-benzoyl-3-(4-hydroxy-3-methoxyphenyl) alanine utilizing dehydroabietylamine as a resolving agent and intermediates in this process.
    Type: Grant
    Filed: December 11, 1969
    Date of Patent: July 13, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Ado Kaiser, Marcel Scheer, Werner Hausermann, Leo Marti
  • Dihydrocoumarin derivatives
    Patent number: 3933859
    Abstract: Process for obtaining 5,6 or 6,7 or 7,8 dihydroxy coumarin or derivatives thereof, which are useful for lower blood pressure and for chemical sympathectomy by oxidizing 2,3 or 3,4 or 4,5 dihydroxyphenyl-propionic acid or derivatives thereof, and novel coumarin derivatives of the process.
    Type: Grant
    Filed: June 12, 1974
    Date of Patent: January 20, 1976
    Assignee: Hoffmann-La Roche, Inc.
    Inventors: Ado Kaiser, Wolfgang Koch, Marcel Scheer, Uwe Wolcke