ALEXANDRIA, Va., March 26 -- United States Patent no. 12,259,492, issued on March 25, was assigned to Tunkia Co. Ltd. (Hunan, China).

"Zero-phase calibration method, computer device and storage medium" was invented by Xinhua Zhou (Hunan, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A zero-phase calibration method includes: selecting a group of range combinations with the same ranges and a group of adjacent range combinations consisting of the range and a smaller range adjacent to the range between different channels of a wide-range meter, measuring phase calibration parameters between channel signals of the group of range combinations with the same ranges and phase calibration parameters between chan...