Patents by Inventor Stephen L. Bell

Stephen L. Bell 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).

  • Manufacture of halogenated compounds
    Patent number: 4129603
    Abstract: Manufacture of 1,1,1,2-tetrafluorethane by reacting 1,1,1-trifluoro-2-chloroethane with hydrogen fluoride in the presence of a chromium oxide catalyst and reducing the 1,1-difluoro-2-chloroethylene content of the impure 1,1,1,2-tetrafluoroethane product by intimately contacting the impure product with an aqueous solution of a metal permanganate.
    Type: Grant
    Filed: February 7, 1978
    Date of Patent: December 12, 1978
    Assignee: Imperial Chemical Industries Limited
    Inventor: Stephen L. Bell