US Patent Issued to HUNTSMAN INTERNATIONAL on March 25 for "Process for making a flexible polyurethane foam having a hardness gradient" (Chinese, German, Belgian Inventors)

ALEXANDRIA, Va., March 26 -- United States Patent no. 12,258,438, issued on March 25, was assigned to HUNTSMAN INTERNATIONAL LLC.

"Process for making a flexible polyurethane foam having a hardness gradient" was invented by Mark Joseph Brennan (Aarschot, Belgium), Chingchung Vincent Huang (Shanghai), Zhicheng George Tian (Shanghai), Alain Germain Marc Veys (Deggendorf, Germany) and Mario Unverdorben (Deggendorf, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A molded flexible polyurethane foam having a hardness gradient going from soft to hard from the top to the bottom of the foam. The hardness gradient in the foam is a result of a foam elasticity gradient which arises from a polymer elasticity gradi...