Patents by Inventor Gerrit J. Polhaar

Gerrit J. Polhaar 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).

  • Detergent containing lithium metal having improved dispersancy and deposit control
    Patent number: 6235688
    Abstract: Non-thixotropic, sodium-free lubricant additive having from 10% to 50% of a liquid organic diluent and from 30% to 90% of a substituted hydrocarbaryl metal salt. At least 30 mole percent of the metal in the metal salt is lithium, and the salt is essentially free of sodium. The BN of the non-thixotropic lubricant additive attributable to the lithium is less than 150. This additive is useful for decreasing black sludge deposits and piston deposits.
    Type: Grant
    Filed: September 24, 1997
    Date of Patent: May 22, 2001
    Assignee: Chevron Chemical Company LLC
    Inventors: Vernon R. Small, Jean-Louis Le Coent, Gerrit J. Polhaar, Ita Suharti Suwandi, William Woodford Willis, Jr.