Patents by Inventor Paul C. Smith, III

Paul C. Smith, III 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).

  • Polymeric microfiber filter medium
    Patent number: 5133878
    Abstract: A filter medium is provided comprising a fibrous matrix to whose surfaces is grafted a superstrate comprising a polymer with quaternary ammonium groups and made from an ethylenically unsaturated monomer containing a quaternary ammonium or amino group, the filter medium having a positive zeta potential at pH 7 and preferably an enhanced Latex Adsorption Capacity together with low extractables and quick rinse-up.
    Type: Grant
    Filed: November 17, 1989
    Date of Patent: July 28, 1992
    Assignee: Pall Corporation
    Inventors: Thomas C. Gsell, Isaac Rothman, Paul C. Smith, III, Jeffrey K. Chambers