Patents by Inventor Ernesto LeFranc

Ernesto LeFranc 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).

  • Touch panel display
    Patent number: 5194863
    Abstract: A system which can control a plurality of opto-matrix input devices. Each opto-matrix device uses multiplexed scanning of emitter/detector pairs under control of a separate computer. The output of the opto-matrix input device is analog data which is provided to the computer for conversion to digital by the computer. The computer then determines if a stylus is located in the opto-matrix field, and if so, determines the stylus location by analysis of the received data.
    Type: Grant
    Filed: November 6, 1991
    Date of Patent: March 16, 1993
    Assignee: International Business Machines Corporation
    Inventors: John H. Barker, Ernesto LeFranc, Donald D. Williams