ALEXANDRIA, Va., March 17 -- United States Patent no. 12,580,296, issued on March 17, was assigned to SEIKO EPSON Corp. (Tokyo).
"Responder and positioning system" was invented by Kimio Nagasaka (Hokuto, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A responder that receives an interrogation wave from an interrogator and transmits a response wave to the interrogator, includes at least one antenna receiving the interrogation wave, a time-series information converter measuring a quadrature phase amplitude of the interrogation wave received by the antenna and converting the quadrature phase amplitude into time-series information, a memory storing the time-series information, and a transmission controller...