Patents by Inventor Stephen J. Webster

Stephen J. Webster 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).

  • Catalytic process for the production of ethyleneamines
    Patent number: 5231229
    Abstract: A catalyst for making polyalkylenepolyamines by the reaction of a monoalkanolamine with an alkyleneamine which contains phosphorus and fluorine on a metal oxide support, the metal being selected from Groups IIIA, IIIB, IVB and VB of the periodic chart. The surface of a support, e.g. titania, is impregnated with at least one compound which contains fluorine and one which contains phosphorus. The same compound can contain both elements, e.g. a fluorophosphoric acid, or two or more compounds, which together contain the required elements, can be employed.
    Type: Grant
    Filed: December 20, 1990
    Date of Patent: July 27, 1993
    Assignee: The Dow Chemical Company
    Inventors: Stephen J. Webster, Lester L. Melton
  • Decolorization of polyalkylene polyamines
    Patent number: 5227528
    Abstract: A process for decolorizing polyalkylene polyamines, which comprises contacting one or more polyalkylene polyamines having an average molecular weight of greater than about 200 and less than about 1000 with carbon at a temperature greater than or equal to about 100.degree. C. and less than or equal to about 300.degree. C. under conditions effective to reduce the color rating of the one or more polyalkylene polyamines.
    Type: Grant
    Filed: April 30, 1992
    Date of Patent: July 13, 1993
    Assignee: The Dow Chemical Company
    Inventors: Stephen J. Webster, John H. Mitchell
  • Catalyst for the production of polyalkylenepolyamines
    Patent number: 4999329
    Abstract: A catalyst for making polyalkylenepolyamines by the reaction of a monoalkanolamine with an alkyleneamine which contains phosphorus and fluorine on a metal oxide support, the metal being selected from Groups IIIA, IIIB, IVB and VB of the periodic chart. The surface of a support, e.g. titania, is impregnated with at least one compound which contains fluorine and one which contains phosphorus. The same compound can contain both elements, e.g. a fluorophosphoric acid, or two or more compounds, which together contain the required elements, can be employed.
    Type: Grant
    Filed: October 6, 1989
    Date of Patent: March 12, 1991
    Assignee: The Dow Chemical Company
    Inventors: Stephen J. Webster, Lester L. Melton