ALEXANDRIA, Va., July 14 -- United States Patent no. 12,680,536, issued on July 14, was assigned to NINGBO JINYU TECHNOLOGY INDUSTRY Co. LTD. (Yuyao, China).
"Single-material hand pump" was invented by Cheng Hang (Yuyao, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to the technical field of hand pump, in particular to a novel single-material hand pump, which includes a pressure head, a valve stem, an elastic part and a cylinder, wherein the bottom of the pressure head is fixedly connected with the valve stem, the cylinder is arranged at the bottom of the valve stem, the valve stem is connected with the cylinder in an embedded way, not only the elliptical columns contract...