Patents by Inventor J. David White

J. David White 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).

  • Rigid filter elements, related apparatus and methods
    Patent number: 4564450
    Abstract: Modules for use in forming rigid filter beds by laying a plurality of the modules upon a planar base comprise a bottom grid unit to the top of which is fixed a rigid, porous layer. The grid unit has several intersecting series of strip elements with structured portions to promote drainage of liquid through and away from the porous layer. The grid unit may also include portions to insure interlocking of the top porous layer thereto.
    Type: Grant
    Filed: November 14, 1984
    Date of Patent: January 14, 1986
    Assignee: Dehydro Corporation
    Inventors: Louis H. Piper, J. David White, Ronald H. Hartman