Patents by Inventor Geung Sig Cha

Geung Sig Cha 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).

  • Potentiometric ion determinations using enhanced selectivity asymmetric ion-selective membrane
    Patent number: 5415746
    Abstract: This invention relates to a process for performing enhanced selectivity potentiometric ion determinations using an asymmetric ion membrane electrode having an asymmetric membrane with a hydrophilic layer fused to an ion-selective layer.
    Type: Grant
    Filed: November 22, 1993
    Date of Patent: May 16, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Geung Sig Cha