Patents by Inventor Denise R. Clark

Denise R. Clark 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).

  • Polymeric materials to self-regulate the level of polar activators in electrorheological fluids
    Patent number: 6065572
    Abstract: Electrorheological systems of improved temperature range are obtained by including within the system a solid polymer insoluble in a low molecular weight activating material and in the hydrophobic medium of the fluid. The polymer contains hydrophilic functionality, and in the polymer a portion of the low molecular weight polar activating material is sorbed in an amount which reversibly increases with increasing temperature.
    Type: Grant
    Filed: May 27, 1998
    Date of Patent: May 23, 2000
    Assignee: The Lubrizol Corporation
    Inventors: Barton J. Schober, Joseph W. Pialet, Robert A. Pollack, Denise R. Clark
  • Polymeric materials to self-regulate the level of polar activators in electrorheological fluids
    Patent number: 5843331
    Abstract: Electrorheological systems of improved temperature range are obtained by including within the system a solid polymer insoluble in a low molecular weight activating material and in the hydrophobic medium of the fluid. The polymer contains hydrophilic functionality, and in the polymer a portion of the low molecular weight polar activating material is sorbed in an amount which reversibly increases with increasing temperature.
    Type: Grant
    Filed: November 13, 1995
    Date of Patent: December 1, 1998
    Assignee: The Lubrizol Corporation
    Inventors: Barton J. Schober, Joseph W. Pialet, Robert A. Pollack, Denise R. Clark