ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,467,731, issued on Nov. 11, was assigned to Magnescale Co. Ltd. (Kanagawa, Japan).

"Rotary encoder, rotary encoder system, and rotation angle detection method using rotary encoder" was invented by Akihiko Sato (Kanagawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A rotary encoder 1 includes a rotary scale 2 having a cylindrical surface 2a as a detected surface and having a relative angle track 2b formed circumferentially on the cylindrical surface 2a, a sensor head 3 arranged with an interval from the cylindrical surface 2a and detecting the relative angle track 2b and outputting a detection signal, and a first angle calculator 4 calculating a...