Patents by Inventor Donald S. Bretl

Donald S. Bretl 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).

  • Microorganism filter and method for removing microorganism from water
    Patent number: 6565749
    Abstract: A filter for removing microorganisms from a fluid is provided by the invention. The filter includes a substrate having a reactive surface, and a polymer covalently bonded to the reactive surface of the substrate. The polymer includes a plurality of cationic groups for attracting microorganisms. Faucet mounted filters and pour through filters containing the polymer coated substrate are provided. Also disclosed are methods for using and manufacturing filters for removing microorganisms from a fluid.
    Type: Grant
    Filed: July 31, 2000
    Date of Patent: May 20, 2003
    Assignee: The Procter & Gamble Company
    Inventors: Kenneth C. Hou, Donald S. Bretl, Richard D. Hembree