ALEXANDRIA, Va., Aug. 20 -- United States Patent no. 12,392,056, issued on Aug. 19, was assigned to Lenzing AG (Lenzing, Austria).
"Counter-flow washing" was invented by Johann Pillichshammer (Frankenmarkt, Austria), Christoph Schrempf (Bad Schallerbach, Austria), Andreas Gressenbauer (Schorfling am Attersee, Austria), Ernst Reiter (Schorfling, Austria) and Martin Neunteufel (Lantau Island, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A process and a system for washing filaments. A filament to be washed and a washing liquid are passed in a countercurrent. The process and the system include two washing stages. In each washing stage the filament is brought into contact with a fresh washing liquid by a ...