ALEXANDRIA, Va., June 16 -- United States Patent no. 12,305,687, issued on May 20, was assigned to GNI. Co. LTD. (South Korea).
"L-shaped bolt fastening structure using hole guard" was invented by Chang Su Lim (Hwaseong-si, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is an L-shaped bolt fastening structure using a hole guard, which is capable of being installed in holes having various sizes. Since an L-shaped bolt is fastened in a state in which a hole guard is mounted on a lower structure, fastening using the L-shaped bolt is applicable to a steel pad having a large hole or a large long hole or a grating in which holes are damaged and have irregular sizes. Since bolts can be installe...