Patents by Inventor Barbara P. Leffel

Barbara P. Leffel 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).

  • Viscosity modifiers in controlled release lubricant additive gels
    Patent number: 7833955
    Abstract: The present invention relates to the use of viscosity modifiers in a control release additive gel. Furthermore, the present invention relates to an additive gel containing a viscosity modifier that control releases additives into a lubricant.
    Type: Grant
    Filed: November 8, 2006
    Date of Patent: November 16, 2010
    Assignee: The Lubrizol Corporation
    Inventors: James D. Burrington, Barbara P. Leffel
  • Viscosity Modifiers in Controlled Release Lubricant Additive Gels
    Publication number: 20080108531
    Abstract: The present invention relates to the use of viscosity modifiers in a control release additive gel. Furthermore, the present invention relates to an additive gel containing a viscosity modifier that control releases additives into a lubricant.
    Type: Application
    Filed: November 8, 2006
    Publication date: May 8, 2008
    Applicant: The Lubrizol Corporation
    Inventors: James D. Burrington, Barbara P. Leffel