Patents by Inventor James C. Wall

James C. Wall 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: 5408721
    Abstract: An automatic dustpan apparatus for central vacuum cleaning systems has a hollow body member that is configured for built-in mounting under cabinetry or in walls adjacent a floor surface, and connection to a conventional central vacuum cleaning system whereby debris on a floor surface may simply be swept to the vicinity of the automatic dustpan and hence into the central vacuum cleaning system where it is discarded. A valve within the dustpan body automatically closes when the dustpan is not in use to permit the other receptacles in the central vacuum cleaning system to function and provision is made to assure against the energizing of the central vacuum cleaning motor when the automatic dustpan is to be used until after the valve of the dustpan has been opened, in order to prevent harmful overloading and other undue damaging strains on the motor during its initial startup and operation.
    Type: Grant
    Filed: December 27, 1993
    Date of Patent: April 25, 1995
    Inventors: James C. Wall, Buzz L. Siler