ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,391,064, issued on Aug. 19.
"Geared chalk line" was invented by William Calvert (Lake Stevens, Wash.).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention is directed to a geared chalk line preferably configured for a left-handed user. The geared chalk line may comprise an enclosure, a reel, a string line, a hook, a plurality of gears, and a crank. The geared chalk line may be a tool for striking a straight line across a work surface using chalk. The enclosure may comprise a chalk box and a gear box. The chalk box may house the reel and the chalk. The string line may be deployed from the reel for use. The plurality of gears may be configu...