ALEXANDRIA, Va., June 17 -- United States Patent no. 12,312,989, issued on May 27, was assigned to Johnson Matthey (Shanghai) Chemicals Ltd. (Shanghai).
"Method for producing gasoline particulate filter" was invented by Wenjie Dong (Shanghai), Hongyu Ji (Shanghai), Dongsheng Qiao (Shanghai), Zhou Shang (Shanghai) and Guangyong Xiong (Shanghai).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for the manufacture of a Gasoline Particulate Filter is disclosed. The method comprises forming a washcoat slurry, coating a wall-flow filter substrate with the washcoat slurry to form a washcoated substrate, and calcining the washcoated substrate to form a Gasoline Particulate Filter. The washcoat slurry comprises...