ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,478,904, issued on Nov. 25, was assigned to DAIKIN INDUSTRIES LTD. (Osaka, Japan).
"Air filter medium and air filter product" was invented by Satoshi Hara (Osaka, Japan), Hiroaki Shintani (Tokyo) and Yoshitaka Ito (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method of producing an air filter includes a first step of preparing a tow band a second step of obtaining a filter medium layer that includes first fibers obtained by applying tension to the tow band to spread the tow band the first fibers having an average fiber diameter of 5 micro metre or more and 50 micro metre or less and second fibers disposed in gaps between the first fibers and h...