Patents by Inventor Carlos E. Littlefield

Carlos E. Littlefield 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).

  • Low noise grease gelling agents
    Patent number: 6916768
    Abstract: The present invention relates to grease gelling agents and greases having low noise characteristics. The greases of the present invention may also exhibit good low shear stability and good heat resistance, as well as the low noise characteristics. The novel grease compositions of the present invention comprise a grease gelling agent comprises a mixture of ?80 weight percent diureas and 0.1-20 weight percent polyureas.
    Type: Grant
    Filed: February 20, 2003
    Date of Patent: July 12, 2005
    Assignee: Chevron U.S.A. Inc.
    Inventors: Carl E. Ward, Carlos E. Littlefield
  • LOW NOISE GREASE GELLING AGENTS
    Publication number: 20040167045
    Abstract: The present invention relates to grease gelling agents and greases having low noise characteristics. The greases of the present invention may also exhibit good low shear stability and good heat resistance, as well as the low noise characteristics. The novel grease compositions of the present invention comprise a grease gelling agent comprises a mixture of ≧80 weight percent diureas and 0.1-20 weight percent polyureas.
    Type: Application
    Filed: February 20, 2003
    Publication date: August 26, 2004
    Inventors: Carl E. Ward, Carlos E. Littlefield