Patents by Inventor Franc Trobec

Franc Trobec 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).

  • Circuit arrangement of a reading device for electromagnetic identification cards
    Patent number: 4782308
    Abstract: A circuit arrangement of a reading device for electromagnetic identification cards having inverters connected in parallel and an LC resonant circuit forming a transmitting oscillator which is influenced by the identification card to change the amplitude of an oscillating signal in order to recognize approach thereto of the card. Detection of the signal amplitude change is utilized to form pulses for subsequent data processing in which the influence of distance between the identification card and the reading device is minimized.
    Type: Grant
    Filed: March 6, 1987
    Date of Patent: November 1, 1988
    Assignee: Iskra-Sozd Elektrokovinske Industrije n.sol.o
    Inventors: Franc Trobec, Marko Zivlakovic, Miro Rozman, Joze Zmavc, Vital Erzen