ALEXANDRIA, Va., Oct. 6 -- United States Patent no. 12,753,614, issued on Oct. 6.
"Knee-guard kneeling board for concrete leveling" was invented by Yanyan Zhou (Kunshan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A knee-guard kneeling board for concrete leveling includes a sliding kneeling board, a support assembly, a fixing assembly, and a lifting assembly. The sliding kneeling board is precision-polished to form a mirror-finished structure, and the sliding kneeling board is fixedly provided with a cushion block. The fixing assembly is located on a side of the sliding kneeling board close to the cushion block. A limiting assembly is disposed on a side of the sliding kneeling board away from the cu...