Patents by Inventor Joel J. Stark

Joel J. Stark 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).

  • Gamma-butyrolactone production catalyst
    Patent number: 5086030
    Abstract: A catalytic hydrogenation process for converting maleic anhydride and/or succinic anhydride to gamma-butyrolactone, a novel selective catalyst for use in such process and a method of preparing the catalyst are provided. The process comprises contacting maleic anhydride and/or succinic anhydride with hydrogen in the presence of catalysts whereby the anhydride is converted to predominantly gamma-butyrolactone. The catalyst of the invention is comprised of transition metals, their oxides and mixtures thereof on a silica gel support having a high surface area and pore volume.
    Type: Grant
    Filed: August 14, 1990
    Date of Patent: February 4, 1992
    Assignee: Phillips Petroleum Company
    Inventors: Geir Bjornson, Joel J. Stark
  • Gamma-butyrolactone production process and catalyst therefor
    Patent number: 4968818
    Abstract: A catalytic hydrogenation process for converting maleic anhydride and/or succinic anhydride to gamma-butyrolactone, a novel selective catalyst for use in such process and a method of preparing the catalyst are provided. The process comprises contacting maleic anhydride and/or succinic anhydride with hydrogen in the presence of catalysts whereby the anhydride is converted to predominantly gamma-butyrolactone. The catalyst of the invention is comprised of transition metals, their oxides and mixtures thereof on a silica gel support having a high surface area and pore volume.
    Type: Grant
    Filed: August 3, 1989
    Date of Patent: November 6, 1990
    Assignee: Phillips Petroleum Company
    Inventors: Geir Bjornson, Joel J. Stark