Patents by Inventor Stephen J. Bancroft

Stephen J. Bancroft 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).

  • Electrostatic spraying apparatus
    Patent number: 4846407
    Abstract: An electrostatic spraying apparatus for spraying liquid has a spraying edge 8 provided with teeth 12. No parts of the apparatus provide a low potential influence near the spraying edge, keeping leakage losses to a minimum. At the voltage provided by a high voltage supply, the field strength at the tips of the teeth 12, is sufficient to form one ligament of liquid per tooth. The ligaments break up into droplets which have a size largely independent of fluctuations in field strength caused by varying the distance from the target to be sprayed.
    Type: Grant
    Filed: April 21, 1987
    Date of Patent: July 11, 1989
    Assignee: Imperial Chemical Industries plc
    Inventors: Ronald A. Coffee, Timothy J. Noakes, Stephen J. Bancroft, Edward J. Bals