Patents by Inventor Richard G. Stellman

Richard G. Stellman 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 hydroconversion process with catalyst retainer
    Patent number: 4374020
    Abstract: An improved process for hydroconversion of mineral oil is disclosed wherein a spherical hydroconversion catalyst having a diameter greater than 6 mm, a surface area above 200 m.sup.2 /gm, and a crush strength above 70 pounds is used to replace the inert materials which are used to support or retain a fixed bed of suitable hydroconversion catalyst.
    Type: Grant
    Filed: March 29, 1979
    Date of Patent: February 15, 1983
    Assignee: Shell Oil Company
    Inventors: Cesar A. Trevino, Richard G. Stellman