Patents by Inventor David J. Lawson

David J. Lawson 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).

  • Patent number: 4751548
    Abstract: A heat and pressure fuser for fixing a toner image to a copy sheet in a xerographic copier has a heated fuser roll cooperating with a backup roll to form a nip through which the copy sheets are passed for fusing. In order to prevent toner offset the fuser roll is provided with a coating of silicone rubber or Viton (trademark) and the outer surface is supplied with a film of liquid release agent. The release agent is contained in a sump and fed to an applicator having a wick bearing against the fuser roll. Static buildup on the fuser roll is avoided because the wick is electrically conductive and is connected to earth potential via the copier frame providing a charge leakage path for the fuser roll. In a preferred form, the wick comprises a woven fabric in which the weft threads are electrically conductive, each such conductive thread comprising one or more stainless steel fibers entwined with a plurality of heat-resistive nylon, e.g. Nomex (trademark), fibers.
    Type: Grant
    Filed: May 12, 1987
    Date of Patent: June 14, 1988
    Inventor: David J. Lawson