US Patent Issued to Tyco Fire Products on Sept. 16 for "Foam proportional mixing device" (Chinese Inventors)

ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,415,104, issued on Sept. 16, was assigned to Tyco Fire Products LP (Cranston, R.I.).

"Foam proportional mixing device" was invented by Jun Xu (Shanghai), Shijie Tu (Shanghai), Dong Han (Shanghai), Zhengxi Ju (Shanghai), Jinyu Ran (Shanghai) and Chengyu Wang (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "A foam proportional mixing device includes a Roots pump and a gear pump. The Roots pump comprises a Roots pump inlet, a pair of rotors and a fluid guide member. The fluid guide member is arranged in the Roots pump inlet, and is configured to guide fluid to flow to the pair of rotors and provide driving forces to the pair of rotors for rotating...