Patents by Inventor Robert Nyvall

Robert Nyvall 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).

  • Biological control of purple loosestrife
    Patent number: 6268203
    Abstract: The present invention provides a novel isolated and purified strain of Sphaeropsis sp. It further provides a mycoherbicidal composition that is effective in controlling purple loosestrife, and methods for controlling purple loosestrife.
    Type: Grant
    Filed: January 29, 1999
    Date of Patent: July 31, 2001
    Assignee: Regents of the University of Minnesota
    Inventors: David R. Johnson, Roger L. Becker, Elizabeth Jean Stamm-Katovich, Robert Nyvall, Donald L. Wyse