Patents by Inventor Michael S. Withers

Michael S. Withers 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).

  • Coextruded multilayer cation exchange membranes
    Patent number: 4437952
    Abstract: Multilayer fluorinated cation exchange membranes prepared by coextrusion of precursor polymers.
    Type: Grant
    Filed: October 25, 1982
    Date of Patent: March 20, 1984
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Roger A. Smith, Michael S. Withers
  • Apparatus for making a web-supported membrane
    Patent number: 4402785
    Abstract: A process and apparatus for continuously forming a reinforced membrane of fluorinated polymers containing sulfonyl and/or carboxyl groups in melt-fabricable form and, after hydrolysis, the corresponding membrane in ion exchange form. The membrane thus formed has exceptional uniformity, and this membrane so made, when used as the membrane which separates the compartments of a chloroalkali cell, offers the advantages of low operating voltage, low power consumption and high current efficiency, and a long useful life without rupture.
    Type: Grant
    Filed: September 10, 1982
    Date of Patent: September 6, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Michael S. Withers
  • Web-supported membrane
    Patent number: 4399183
    Abstract: A process and apparatus for continuously forming a reinforced membrane of fluorinated polymers containing sulfonyl and/or carboxyl groups in melt-fabricable form and, after hydrolysis, the corresponding membrane in ion exchange form. The membrane thus formed has exceptional uniformity, and this membrane so made, when used as the membrane which separates the compartments of a chloralkali cell, offers the advantages of low operating voltage, low power consumption and high current efficiency, and a long useful life without rupture.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: August 16, 1983
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Michael S. Withers
  • Process for cation permeable membrane with reinforcement fabric embedded therein and product thereof
    Patent number: 4341605
    Abstract: A cation permeable membrane containing areas of thin wall construction comprises a cation exchange polymer matrix having a reinforcement fabric embedded therein.A two-step lamination procedure is described where holes are formed in a film of laminated polymer prior to a second lamination step.The cation permeable membrane has utility in membrane ion exchange, reverse osmosis devices or in electrolytic cells such as chlor-alkali cells.
    Type: Grant
    Filed: January 16, 1981
    Date of Patent: July 27, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John C. Solenberger, Michael S. Withers
  • Process for forming a reinforced membrane
    Patent number: 4324606
    Abstract: A process and apparatus for continuously forming a reinforced membrane of fluorinated polymers containing sulfonyl and/or carboxyl groups in melt-fabricable form and, after hydrolysis, the corresponding membrane in ion exchange form. The membrane thus formed has exceptional uniformity, and this membrane so made, when used as the membrane which separates the compartments of a chloralkali cell, offers the advantages of low operating voltage, low power consumption and high current efficiency, and a long useful life without rupture.
    Type: Grant
    Filed: February 14, 1980
    Date of Patent: April 13, 1982
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Michael S. Withers