Patents by Inventor Dennis R. Stevens

Dennis R. Stevens 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).

  • Organopolysulfide-impregnated catalyst and methods of preparation and use
    Patent number: 4725569
    Abstract: An organopolysulfide-impregnated catalyst composition usable to hydrotreat petroleum and other hydrocarbon feedstock is described. Also disclosed are processes for making and using the composition.
    Type: Grant
    Filed: November 27, 1984
    Date of Patent: February 16, 1988
    Inventors: William J. Tuszynski, Dennis R. Stevens