ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,497,494, issued on Dec. 16, was assigned to Teknologian tutkimuskeskus VTT Oy (Espoo, Finland).
"Cellulose-based extrusion foams" was invented by Pia Willberg-Keyrilainen (Espoo, Finland), Jarmo Ropponen (Espoo, Finland), Tero Malm (Espoo, Finland), Teijo Rokkonen (Espoo, Finland), Hannu Minkkinen (Espoo, Finland) and Ali Harlin (Espoo, Finland).
According to the abstract* released by the U.S. Patent & Trademark Office: "According to an example aspect of the present invention, there is provided an extrusion foaming method for producing low-density extrusion foam from a thermoplastic cellulose-based starting material."
The patent was filed on May 10, 2021, under Application No. 17/92...