ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,421,639, issued on Sept. 23, was assigned to QINGDAO HAIER LAUNDRY ELECTRIC APPLIANCES Co. LTD (Qingdao, China) and HAIER SMART HOME Co. LTD. (Qingdao, China).

"Ventilation control method for laundry device" was invented by Kai Liu (Qingdao, China), Sheng Xu (Qingdao, China), Ziqiang Wang (Qingdao, China) and Mingli Zhou (Qingdao, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A ventilation control method for a laundry device including: acquiring a present current of an air inflow fan when it is started; determining whether a water seal is formed by water in a water inflow pipe based on the present current, where when the present current reaches ...