US Patent Issued to ASAHI INOVEX on Feb. 11 for "Watertight structure for flap gate and flap gate comprising same" (Japanese Inventors)

ALEXANDRIA, Va., Feb. 12 -- United States Patent no. 12,221,757, issued on Feb. 11, was assigned to ASAHI INOVEX Corp. (Sapporo, Japan).

"Watertight structure for flap gate and flap gate comprising same" was invented by Tetsuo Onodera (Sapporo, Japan), Koji Sasayama (Sapporo, Japan) and Toshio Tsuchiya (Sapporo, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A watertight structure in a flap gate 1 provided with a weight-balance supported door 2 to open an opening 200 of a floodgate 100 in a state in which no external force other than gravity is applied, wherein the structure has: a gap opening-closing member 72 that oscillates in the water flow direction and opens and closes a gap C, wherein the gap C ...