ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,546,299, issued on Feb. 10, was assigned to HITACHI HIGH-TECH Corp. (Tokyo).
"Liquid delivery pump" was invented by Nobuhiro Tsukada (Tokyo), Daisuke Kanai (Tokyo), Sho Iwasa (Tokyo), Yushi Harada (Tokyo) and Yusuke Yota (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A liquid delivery pump delivers a liquid with high flow rate accuracy in consideration of solvent expansion, pressure dependent leakage of the solvent, and flow rate dependent leakage of the solvent. A liquid delivery pump includes first and second plunger pumps connected together, having respective first and second plungers. A pressure sensor measures a liquid delivery pressure (P2)...