Patents by Inventor Edmund Vollrath

Edmund Vollrath 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).

  • Traffic signal installation comprising an led-light source
    Patent number: 6858994
    Abstract: A traffic signal installation with an LED light source (2), comprising: an input (38, 40) for connection of a current source; furthermore, at potential levels between the upper potential (16) and the base potential (18): a plurality of LEDs (4) arranged in at least two series connections of several LEDs that are connected in parallel; a coil (6) provided in series with the LEDs (4); a recovery diode (8) provided in parallel to the LEDs (4) and the coil (6) and having its forward direction opposed to that of the LEDs (4); and a rapid electronic switch (10) provided in series with the LEDs (4), the coil (6) and the recovery diode (8) in parallel to the LEDs (4) and the coil (6); and a pulse generator (12) that is connected to the rapid electronic switch (12) and generates pulses that open and close the rapid electronic switch (10), said pulse generator (12) being a pulse-width modulator in particular in the form of an integrated component.
    Type: Grant
    Filed: May 25, 2001
    Date of Patent: February 22, 2005
    Inventor: Edmund Vollrath
  • Traffic signal installation comprising and led-light source
    Publication number: 20040041526
    Abstract: A traffic signal installation with an LED light source (2), comprising:
    Type: Application
    Filed: May 19, 2003
    Publication date: March 4, 2004
    Inventor: Edmund Vollrath