Patents by Inventor Douglas A. VanderHoff

Douglas A. VanderHoff 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).

  • Fluidization patient support control system
    Patent number: 4835802
    Abstract: Disclosed herein is a fluidization patient support system that enables decrease and elimination of the unpleasant and aggravating "pinging" sensation to which patients are presently exposed. The flow rate of air to the plenum chamber beneath the diffuser and fluidization material is controlled by a valve in the air flow conduit, there being a diversionary discharge outlet at the valve, such that the valve can control the ratio of air flow to the diversionary outlet and to the plenum.
    Type: Grant
    Filed: February 22, 1988
    Date of Patent: June 6, 1989
    Assignees: The KMW Group, Inc., Keisei Medical Industrial Co., Ltd.
    Inventors: Larry J. Purcey, Douglas A. VanderHoff, Robert H. Vreeland, James P. Nielsen, Iowa Ueno