ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,510,683, issued on Dec. 30.
"Metal detector" was invented by Maoquan Deng (Shenzhen, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A metal detector includes a detection disc, a detection rod rotationally connected to the detection disc, a protective sleeve detachably connected within the detection rod, and electronic components housed within the protective sleeve. The electronic components include a main circuit board extending along the length of the protective sleeve and a secondary circuit board perpendicular to the main circuit board, positioned near the opening of the protective sleeve. On the side of the secondary circuit board facing the i...