Patents by Inventor Ferencz Nandor Toth

Ferencz Nandor Toth 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).

  • Intrinsically safe display device with an array of LEDs
    Patent number: 9226361
    Abstract: An intrinsically safe LED display device with an array of LED circuit cells is provided. Each cell comprises a LED or a group of LEDs, which are individually made intrinsically safe in a conventional way, by limiting a dissipated power through the LED circuit cell by means of a resistor or group of resistors in series with the LED or group of LEDs. In addition a switching type PTCs with a switching temperature between 80 and 125 degrees centigrade are added in each cell, in series with the resistors or group of resistors of the LED circuit cells respectively, in thermal contact with the resistor or group of resistors of the LED circuit cell. In this way intrinsic safety is provided for mutual heating of adjoining LED circuit cells wherein the LEDs or groups of LEDs are short circuited.
    Type: Grant
    Filed: September 29, 2011
    Date of Patent: December 29, 2015
    Assignee: EUROPEAN INTELLIGENCE B.V.
    Inventor: Ferencz Nandor Toth
  • Intrinsically Safe Display Device with an Array of LEDS
    Publication number: 20130241416
    Abstract: An intrinsically safe LED display device with an array of LED circuit cells is provided. Each cell comprises a LED or a group of LEDs, which are individually made intrinsically safe in a conventional way, by limiting a dissipated power through the LED circuit cell by means of a resistor or group of resistors in series with the LED or group of LEDs. In addition a switching type PTCs with a switching temperature between 80 and 125 degrees centigrade are added in each cell, in series with the resistors or group of resistors of the LED circuit cells respectively, in thermal contact with the resistor or group of resistors of the LED circuit cell. In this way intrinsic safety is provided for mutual heating of adjoining LED circuit cells wherein the LEDs or groups of LEDs are short circuited.
    Type: Application
    Filed: September 29, 2011
    Publication date: September 19, 2013
    Applicant: EUROPEAN INTELLIGENCE B.V.
    Inventor: Ferencz Nandor Toth