Patents by Inventor John A. Rothfus

John A. Rothfus 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).

  • Production of homodeoxyharringtonine and other cephalotaxine esters by tissue culture
    Patent number: 4152214
    Abstract: Tissue of Cephalotaxus harringtonia has been successfully cultured and cephalotaxine and its chemotherapeutically active alkaloid esters have been recovered from the resultant callus and the culture medium. A novel alkaloid compound, homodeoxyharringtonine, has also been discovered in the culture medium.
    Type: Grant
    Filed: October 7, 1977
    Date of Patent: May 1, 1979
    Assignee: The United States of America as represented by the Secretary of Agriculture
    Inventors: Norman E. Delfel, John A. Rothfus