Patents by Inventor Jeffrey E. Spethmann

Jeffrey E. Spethmann 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).

  • Composite membrane with highly crystalline porous support
    Patent number: 6110333
    Abstract: A composite membrane including an ion exchange polymer and a support of expanded polytetrafluoroethylene polymer having a porous microstructure of polymeric fibrils, said expanded polytetrafluoroethylene polymer being at least about 85% crystalline.
    Type: Grant
    Filed: April 30, 1998
    Date of Patent: August 29, 2000
    Assignees: E. I. du Pont de Nemours and Company, Donaldson & Co.
    Inventors: Jeffrey E. Spethmann, James Thomas Keating