Patents by Inventor Douglas A. Hanggi

Douglas A. Hanggi 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).

  • High stability porous zirconium oxide spherules
    Patent number: 5015373
    Abstract: The present invention provides a stable stationary phase for chromatography which comprises porous ZrO.sub.2 spherules coated with a cross-linked polymer coating wherein said coated spherules have a pore size from about 20-500 .ANG. and a particle diameter range of about 0.5-500 microns, and are stable in basic media to pHs of up to about 14.
    Type: Grant
    Filed: October 11, 1989
    Date of Patent: May 14, 1991
    Assignee: Regents of the University of Minnesota
    Inventors: Peter W. Carr, Eric F. Funkenbusch, Martin P. Rigney, Patrick L. Coleman, Douglas A. Hanggi, Wes A. Schafer