ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,419,535, issued on Sept. 23, was assigned to KONINKLIJKE PHILIPS N.V. (Eindhoven, Netherlands).
"Passive wireless coil-based markers and tracking system" was invented by Bernhard Gleich (Hamburg, Germany), Jurgen Erwin Rahmer (Hamburg, Germany), Ingo Schmale (Hamburg, Germany), Tim Nielsen (Hamburg, Germany) and Richard Moessel (Hamburg, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A wireless passive marker device (1) to be tracked and a respective tracking system (3) are provided which make use of a sensing unit (10) comprising a resonator element (11) with piezoelectric properties and a coil element (13), whereby an externally applied excit...