ALEXANDRIA, Va., May 19 -- United States Patent no. 12,628,898, issued on May 19, was assigned to SHOEI Co. Ltd. (Tokyo).
"Helmet and chin strap" was invented by Kyosuke Ishikawa (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "This helmet includes a cap body and a chin strap that is arranged on the inner side of the cap body. The chin strap is woven into a strap shape using weft threads and warp threads. The warp threads include a first warp thread constituted by a first fiber, and a second warp thread constituted by a second fiber, which is made of ultra high molecular weight polyethylene. The tensile strength and the elastic modulus of the second fiber are greater than those of the first fiber. The w...