Patents by Inventor Randy C. John

Randy C. John 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).

  • Process and article
    Patent number: 5169515
    Abstract: A process for heat treatment of high temperature steels in which the steels are heated to temperatures of at least 1800.degree. F. in the presence of hydrogen gas, methane, hydrogen sulfide, and steam. Articles made by the process have a unique layer enriched in chromium oxide, and reactor components made from the treated steel may be used in a process for the pyrolysis of liquid and gaseous hydrocarbons to inhibit coking.
    Type: Grant
    Filed: December 4, 1991
    Date of Patent: December 8, 1992
    Assignee: Shell Oil Company
    Inventors: Danny Y. Ngan, Randy C. John