Patents by Inventor Wallace Eldon Embrey

Wallace Eldon Embrey 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).

  • Preparation of tetrachloropyridine
    Patent number: 3993654
    Abstract: Tetrachloropyridine is prepared by heating pentachloropyridine in an aqueous medium under pressure, with agitation, in the presence of a particulate oxidizable metal, e.g., zinc and a hydrogen-producing acid, e.g., hydrogen chloride. The tetrachloropyridine is then conveniently extracted with an inert, water-immiscible solvent, e.g., a halogenated hydrocarbon.
    Type: Grant
    Filed: May 16, 1974
    Date of Patent: November 23, 1976
    Assignee: The Dow Chemical Company
    Inventors: Norman LeRoy Dean, Wallace Eldon Embrey, John Thomas Marshall