Patents Assigned to Donaldson & Co.
  • 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