Patents by Inventor Barbara E. Williams

Barbara E. Williams 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).

  • Process for imparting an electrostatic charge to powders to render them useful for coating application
    Patent number: 5585426
    Abstract: A process for improving the electrostatic charge developed on a resin powder composition for electrostatic coating of solid objects and the method of application thereof. The resin powder comprises (i) a thermosetting or thermoplastic resin and (ii) an electrostatic property modifying agent (polyalkylene ether, polyalkylene glycol, polyethoxylated stearyl alcohol) incorporated in the resin or on the surface of the resin. The methods of application of the powder involves charging the powder by electrical induction/conduction and spraying the charged powder onto a grounded solid object to which it adheres prior to the thermal fusing to produce a permanent finish.
    Type: Grant
    Filed: October 5, 1994
    Date of Patent: December 17, 1996
    Assignee: Nexus Corporation
    Inventors: Barbara E. Williams, Ian Harpur, Graham Hearn
  • Apparatus for coating substrates with inductively charged resinous powder particles
    Patent number: 5518546
    Abstract: An apparatus for improving the electrostatic charge developed on a resin powder composition for electrostatic coating of solid objects and the method of application thereof. The apparatus comprises a device for charging the powder by electrical induction/conduction such that the powder particles have a resistivity of from about 10.sup.9 to about 10.sup.13 ohm.meters at 20 percent relative humidity and spraying the charged powder onto an grounded solid object to which it adheres prior to the thermal fusing to produce a permanent finish.
    Type: Grant
    Filed: October 5, 1994
    Date of Patent: May 21, 1996
    Assignee: eNexus Corporation
    Inventors: Barbara E. Williams, Ian Harpur, Graham Hearn, John F. Hughes