Patents by Inventor Alan H. Stull

Alan H. Stull 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).

  • Variable resistance device
    Patent number: 5570076
    Abstract: The present invention provides a variable resistance device having at least one pair of channels retaining a conductive ball between them. The channels contain a resistive element and a conductive element and movement of the conductive ball within the channels, caused by rotation of the channels relative to each other, provides a variable resistance.
    Type: Grant
    Filed: July 18, 1994
    Date of Patent: October 29, 1996
    Inventors: Bruce L. Erickson, Alan H. Stull