ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,479,934, issued on Nov. 25, was assigned to POSTECH RESEARCH AND BUSINESS DEVELOPMENT FOUNDATION (Pohang-si, South Korea).

"Water responsive soft actuator and driving method thereof" was invented by Dong Sung Kim (Pohang-si, South Korea), Hyeon Seok Han (Pohang-si, South Korea) and Andrew Choi (Pohang-si, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a water responsive soft actuator using water responsive hydrogel whose volume hardly changes, and a method for driving the soft actuator. The water responsive soft actuator according to the invention includes polyisopropylacrylamide, and the polyisopropylacrylamide has ...