Patents by Inventor Friedhelm Schroder

Friedhelm Schroder 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 production of .beta.-elemonic acid and pharmaceutical preparations containing said acid
    Patent number: 4618605
    Abstract: Disclosed is a process for the production of .beta.-elemonic acid from an alcoholic solution of gum elemi by recovering a crude mixture of elemi acids containing .beta.-elemonic acid, .DELTA..sup.7 .alpha.-elemonic acid and .DELTA..sup.8 .alpha.-elemolic acid by the use of a basic ion exchanger, isomerizing the .DELTA..sup.7 .alpha.-elemolic acid to .DELTA..sup.8 .alpha.-elemolic acid in a chlorinated hydrocarbon by use of a mineral acid, oxidizing the .DELTA..sup.8 .alpha.-elemolic acid to yield additional .beta.-elemonic acid and separating and purifying the total resulting .beta.-elemonic acid from the acid mixture. Also disclosed are pharmaceutical preparations for the treatment of inflammatory conditions containing .beta.-elemonic acid as the active ingredient.
    Type: Grant
    Filed: October 15, 1984
    Date of Patent: October 21, 1986
    Inventors: Gunter Stapel, Karl-Heinz Gober, Sigurd Leyck, Helmut Wetzig, Christian Birkner, Kurt Kesselring, Bruno Christ, Klaus Steiner, Friedhelm Schroder