ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,447,481, issued on Oct. 21, was assigned to NINGBO YANGTENG XINGYE MACHINERY Co. LTD (Ningbo, China).
"Nozzle structure with forward and reverse water sealing" was invented by Cheng-Yu Wang (Zhejiang, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A nozzle structure with forward and reverse water sealing, comprising a nozzle head, a cover, and a plurality of sealing rings. The two ends of the nozzle head are the water-filling end and the spraying end respectively, a drainage aperture is pierced on the side of the spraying end, a guide cone is provided at the upper end, and a stopper is installed convexly on the outer periphery at the end portion o...