Patents by Inventor Joseph E. Tropea

Joseph E. Tropea 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).

  • Novel pyrrolizidine alkaloid
    Patent number: 5021427
    Abstract: The present invention involves a purified bioactive compound of the formula: ##STR1## wherein at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are H or an acyl having less than about five carbon atoms. More specifically the preferred purified bioactive compound is (1R, 1R, 3R, 7S, 7aR)-3-hydroxymethyl-1,2,7-trihydroxypyrrolizidine.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: June 4, 1991
    Assignee: The Board of Regents, The University of Texas System
    Inventors: Alan D. Elbein, Joseph E. Tropea