ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,553,818, issued on Feb. 17, was assigned to Q.ANT GMBH (Stuttgart, Germany).

"Method for calibrating a particle sensor, particle sensor, and apparatus having a particle sensor" was invented by Michael Foertsch (Ansbach, Germany), Stefan Hengesbach (Stuttgart, Germany), Jens Grimmel (Tuebingen, Germany) and Helge Hattermann (Pliezhausen, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for calibrating a particle sensor includes focusing a laser beam on a calibration plane for generating a calibration intensity distribution in the calibration plane. A calibration plate is arranged in the calibration plane. Contrast regions for modulating an...