Patents by Inventor David T. Polkinghorne

David T. Polkinghorne 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: 6364247
    Abstract: The present invention provides a pneumatic flotation device for use in a continuous web processing system for continuously processing paper and other flexible materials and a method of making the pneumatic flotation device. The pneumatic floatation device replaces the rolls, idlers and air bars currently used in continuous processing systems. The pneumatic floatation device includes a microporous sheet attached to a suitable pneumatic support structure. The microporous sheet has a smooth exterior layer with regularly spaced pores that enables air to pass therethrough. The interior layer of the sheet is an open structure metal fabric that enables air to move freely along two axes of the sheet parallel to the exterior layer while in contact with the pneumatic support structure. In one preferred embodiment, the pneumatic support structure includes a rigid tube and an airflow device in fluid communication with the microporous sheet.
    Type: Grant
    Filed: January 31, 2000
    Date of Patent: April 2, 2002
    Inventor: David T. Polkinghorne