Patents by Inventor John MacDuff

John MacDuff 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: 3963899
    Abstract: A voting machine employs a scroll-type multi-layer ballot structure including removable strips carried by the upper layer and a pressure responsive means in the lower layer to reproduce markings made on the removable strips. Each removable strip carries a voter number so that an audit of each ballot can be made by the voter without revealing his identity. The multi-layer scroll-type structure is carried behind a panel having a slot therein extending in the direction of the removable strips and a door covering the slot which is prevented from opening to provide access to the strips in response to operation of the mechanism which senses whether or not a strip has been removed.
    Type: Grant
    Filed: May 9, 1975
    Date of Patent: June 15, 1976
    Inventor: John MacDuff