ALEXANDRIA, Va., June 4 -- United States Patent no. 12,319,718, issued on June 3, was assigned to Spiber Inc. (Tsuruoka, Japan).
"Modified fibroin" was invented by Keisuke Morita (Tsuruoka, Japan), Yunosuke Abe (Tsuruoka, Japan), Hiroyuki Nakamura (Tsuruoka, Japan), Shota Togashi (Tsuruoka, Japan) and Tetsuo Asakura (Fuchu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a modified fibroin including a domain sequence represented by Formula 1: [(A)n motif-REP]m or Formula 2: [(A)n motif-REP]m-(A)n motif, and having a serine residue content rate of less than 5.5%.[In Formula 1 and Formula 2, the (A)n motif represents an amino acid sequence consisting of 4 to 27 amino acid ...