Patents by Inventor David C. McKnight

David C. McKnight 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: 7302767
    Abstract: A water flow simulation system for audio and visual illusion has an inner conduit and an outer conduit spaced apart to define a flow channel therebetween. A blower directs a flow of air through the inner conduit from one end to an opposite end where at least some of the air exits and is redirected through the flow channel and back to the blower. The conduits are formed of clear plastic and a light source is positioned to light up a plurality of objects floating in the airflow to produce a visual effect of moving water. A sound source operates concurrently with the blower to produce a sound reminiscent of rippling water. The light source can change colors and strobe to enhance the visible image. A lenticular lens on an inner surface of the outer conduit also enhances the image.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: December 4, 2007
    Inventor: David C. McKnight
  • Patent number: 4844447
    Abstract: An apparatus for producing a sound and visual display has a generally upstanding tubular body having a circumferential wall defining a centrally located vertically extending longitudinal axis. A reservoir is formed in the lower part of the generally cylindrical tubular body with a plurality of bead-like objects normally stored in the reservoir. An auger is used to transport the bead-like objects from the reservoir to an upper portion of the generally cylindrical tubular body. The body also includes a plurality of generally horizontally extending spokes supported on the circumferential wall and extending inwardly at vertical intervals with respect to the vertically extending longitudinal axis. A plate forms the bottom of the upper portion of the body and extends in a direction generally perpendicular to the vertically extending longitudinal axis and includes at least one releasable door therein.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: July 4, 1989
    Inventor: David C. McKnight