Patents by Inventor Paul G. Rodewald, Jr.

Paul G. Rodewald, Jr. 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).

  • Zeolite catalysts having stabilized hydrogenation-dehydrogenation function
    Patent number: 6541408
    Abstract: A zeolite catalyst suitable for use in shape-selective hydrocarbon conversion processes. The catalyst is modified by incorporation therein of a hydrogenation-dehydrogenation functional metal, followed by gradient selectivation with an organosilicon compound under conversion conditions, wherein the gradient selectivation conditions are characterized by a progressive temperature gradient. The use of a progressive temperature gradient during the in situ selectivation procedure unexpectedly yields a catalyst in which the hydrogenation-dehydrogenation function is stabilized, thereby enabling long duration hydrocarbon conversion processes with low by-product make.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: April 1, 2003
    Assignee: ExxonMobil Oil Corp.
    Inventors: Clarence D. Chang, Paul G. Rodewald, Jr.
  • Zeolite catalysts having stabilized hydrogenation-dehydrogenation function
    Patent number: 6346498
    Abstract: A zeolite catalyst suitable for use in shape-selective hydrocarbon conversion processes. The catalyst is modified by incorporation therein of a hydrogenation-dehydrogenation functional metal, followed by gradient selectivation with an organosilicon compound under conversion conditions, wherein the gradient selectivation conditions are characterized by a progressive temperature gradient. The use of a progressive temperature gradient during the in situ selectivation procedure unexpectedly yields a catalyst in which the hydrogenation-dehydrogenation function is stabilized, thereby enabling long duration hydrocarbon conversion processes with low by-product make.
    Type: Grant
    Filed: December 19, 1997
    Date of Patent: February 12, 2002
    Assignee: ExxonMobil Oil Corporation
    Inventors: Clarence D. Chang, Paul G. Rodewald, Jr.