Patents by Inventor Helmut C. Neumann

Helmut C. Neumann 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).

  • Polycyclic cyanoketones
    Patent number: 4395423
    Abstract: (18.beta. and 18.alpha.)-2.alpha.-Cyano-3,11-dioxo-olean-12-en-29-oic acids and lower-alkyl esters thereof, useful as ulcer preventing and ulcer healing agents, are prepared from 18.beta.- or 18.alpha.-glycyrrhetinic acid, the final step being alkaline cleavage of 18.beta.- or 18.alpha.-11-oxo-olean-2,12-dieno[2,3-d]isoxazol-29-oic acid or an ester thereof.
    Type: Grant
    Filed: December 6, 1979
    Date of Patent: July 26, 1983
    Assignee: Sterling Drug Inc.
    Inventor: Helmut C. Neumann