ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,447,730, issued on Oct. 21, was assigned to Seiko Epson Corp. (Tokyo).
"Method of manufacturing soundproof sheet and soundproof sheet" was invented by Hideaki Yajima (Nagano, Japan) and Yuta Okawa (Nagano, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method of manufacturing a soundproof sheet includes a first accumulating step of producing a web in which a plurality of first fibers, which are natural fibers, and a plurality of second fibers including a first core portion and a first coating layer coating the first core portion and having a first melting point are mixed, a heating step of heating the web to melt the first coating layer, a press...