Patents by Inventor David Stem

David Stem 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).

  • Catalyst system to manufacture low sulfur fuels
    Publication number: 20050032629
    Abstract: The instant invention relates to a catalyst system used in the production of high octane, low sulfur naphtha products through skeletal isomerization of feed olefins and hydrotreating with the optional removal of basic nitrogen-containing compounds.
    Type: Application
    Filed: July 9, 2004
    Publication date: February 10, 2005
    Inventors: Stuart Shih, David Stem, Madhav Acharya, Robert Welch, Gordon Stuntz