ALEXANDRIA, Va., April 15 -- United States Patent no. 12,603,976, issued on April 14.
"Foundation projection line-drawing device and a line-drawing method for a sports field" was invented by Bingrong Gu (Ji 'an, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A line-drawing method for a sports field comprises: the foundation projection line-drawing device obtaining court options input by a user, and obtaining a court size and court shape according to the court options; scanning a pre-projection site to determine the safety of the pre-projection site; if the pre-projection site is safe, using the current pre-projection site as a target projection site, and turning on a laser unit according to the court s...