Patents by Inventor Sylvie Wuidart

Sylvie Wuidart 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).

  • Locking device with a never-programmable floating gate cell
    Patent number: 5270562
    Abstract: Locking devices are made by using a floating gate cell which is put into a state of being never programmable electrically by placing a voltage limiter between its drain zone and the ground and between its source zone and the ground. The cell can no longer ever be programmed by ultra-violet rays because of the interposition of a metal pad above its control gate. A voltage limiter is made by using a Zener diode made by the joining, to the drain and source zones, of a zone with opposite doping, placed outside the channel zone and connected to the ground.
    Type: Grant
    Filed: November 15, 1991
    Date of Patent: December 14, 1993
    Assignee: SGS-Thomson Microelectronics S.A.
    Inventor: Sylvie Wuidart