Patents by Inventor Richard A. Hanmer

Richard A. Hanmer 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).

  • Electrolytic cell vermiculite diaphragms
    Patent number: 4426272
    Abstract: Diaphragms for use in electrolytic cells, e.g., chlor-alkali cells, are beneficially prepared using pulverized expanded vermiculite in place of the historically popular asbestos.
    Type: Grant
    Filed: May 10, 1982
    Date of Patent: January 17, 1984
    Assignee: The Dow Chemical Company
    Inventor: Richard A. Hanmer
  • Polymer-bonded crocidolite asbestos diaphragms and method for forming same
    Patent number: 4260453
    Abstract: Thermoplastic dispersions of fluoropolymers are intimately mixed with an aqueous slurry of crocidolite asbestos at very low pH, the resulting aqueous slurry mixture is formed into diaphragms for use in a chlor-alkali electrolytic cell while being de-watered, and heat-bonded.
    Type: Grant
    Filed: August 27, 1979
    Date of Patent: April 7, 1981
    Assignee: The Dow Chemical Company
    Inventor: Richard A. Hanmer