Patents by Inventor Shiobal Banerjee

Shiobal Banerjee 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).

  • Process for making composite ion exchange membranes
    Patent number: 6156451
    Abstract: A process for making a composite ion exchange membrane including fabricating a layered membrane precursor including a microporous support of highly fluorinated nonionic polymer adhered to a layer of highly fluorinated sulfonyl halide polymer, hydrolyzing the layered membrane precursor to convert the highly fluorinated sulfonyl halide polymer to highly fluorinated sulfonate polymer, impregnating the microporous support with a dispersion of highly fluorinated sulfonate polymer or precursor thereof in a polar liquid medium after hydrolyzing, removing the polar liquid medium, and heating to coalesce the highly fluorinated sulfonated polymer in the support.
    Type: Grant
    Filed: May 2, 1997
    Date of Patent: December 5, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Shiobal Banerjee, John Donald Summers