Patents by Inventor Mark L. Tierney

Mark L. Tierney 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).

  • Ashless or reduced ash quaternary detergents
    Patent number: 8765650
    Abstract: A composition of an oil-soluble ionic detergent that does not contribute metal ions to the composition, and which comprises a quaternary non-metallic pnictogen cation and an organic anion having at least one hydrocarbyl group of sufficient length to impart oil solubility to the detergent, the detergent having a total base number (TBN) to total acid number (TAN) ratio of at least 2:1 imparts ash-free basicity to a lubricant composition.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: July 1, 2014
    Assignee: The Lubrizol Corporation
    Inventors: Ewan E. Delbridge, Virginia A. Carrick, John K. Pudelski, Matthew D. Gieselman, Christopher L. Friend, Patrick E. Mosier, Michelle M. Rogers, Mark L. Tierney