Patents by Inventor Theodore S. Graff

Theodore S. Graff 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: 4055735
    Abstract: A touch sensitive device includes an arrangement of conductors in combination with a pressure sensitive electrically conductive material. The conductors appear in a cross-wire matrix imprinted on the top and bottom surfaces of a rigid printed circuit board. The pressure sensitive electrically conductive material is positioned over the cross-wire matrix of spaced electrical conductors. The resulting arrangement defines a plurality of touch sensitive locations which may be used for uniquely entering information in a data entry system.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: October 25, 1977
    Assignee: Honeywell Information Systems Inc.
    Inventors: Joseph J. Eachus, Theodore S. Graff
  • Patent number: 4013835
    Abstract: A novel data entry system is disclosed which comprises both a touch sensitive device and a location identification device. The touch sensitive device includes a printed circuit board arrangement of conductors which define data input locations that are touch sensitive. The locations are touch sensitive by virtue of a layer of variable resistance material disposed over the printed circuit board which is highly conductive when subjected to touch pressure. The electrical conductivity of a touched location is sensed by the location identification device which thereafter provides a digital coding of the location and maintains the same until the touch pressure has been removed. The location identification device moreover prevents the double entry of data due to any variation in the touch pressure.
    Type: Grant
    Filed: October 23, 1975
    Date of Patent: March 22, 1977
    Assignee: Honeywell Information Systems, Inc.
    Inventors: Joseph J. Eachus, Theodore S. Graff, Douglas H. Seggelin