ALEXANDRIA, Va., May 26 -- United States Patent no. 12,638,096, issued on May 26.
"Positive and negative pressure resistant water seal protection device and a toilet device" was invented by Chengxu Jiang (Shenyang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "This application belongs to the technical field of water seal protection for sewer pipes. More specifically, specifically relates to a positive and negative pressure resistant water seal protection device and a toilet device is disclosed. This application can actively provide closing force, has reliable sealing, and is equipped with a water seal protection device for both positive and negative pressure, as well as a toilet device using the same....