Patents by Inventor Michael Rombs

Michael Rombs 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).

  • Lubricant base oil processing
    Patent number: 5275718
    Abstract: A hydrofinishing process for improving the color, thermal and oxidative stability of a base stock for lubricating oil wherein the lubricating oil stock is contacted with hydrogen in the presence of a nickel-molybdenum catalyst, at a pressure in the range of 400 psi to 3000 psi, at a weight hourly space velocity in the range of 0.25-4.5 and at a temperature in the range of 550.degree. F. to 750.degree. F.
    Type: Grant
    Filed: April 19, 1991
    Date of Patent: January 4, 1994
    Assignee: Lyondell Petrochemical Company
    Inventors: C. Monroe Copeland, Frank McKay, John M. Noreyko, Michael Rombs, Darrell Sutherland