Patents by Inventor Raghunath Chilkunda

Raghunath Chilkunda 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).

  • Modification of polyvinylidene fluoride membrane and method of filtering
    Patent number: 5531900
    Abstract: There is provided a filter medium comprising a microporous polyvinylidene fluoride membrane and a polymer containing a positively charged organic phosphonium compound grafted to the membrane in a concentration sufficient to provide a surface of said membrane with a positive charge such that there is minimal susceptibility to the extraction of said polymer. The polymer may also contain an acrylate or methacrylate. There is also provided a method for ultrapurifying a liquid and an ultrapurifying system for water.
    Type: Grant
    Filed: July 7, 1994
    Date of Patent: July 2, 1996
    Assignee: University of Arizona
    Inventors: Srini Raghavan, Der'e Jan, Raghunath Chilkunda