ALEXANDRIA, Va., April 7 -- United States Patent no. 12,594,609, issued on April 7, was assigned to BIG DAISHOWA Co. LTD. (Osaka, Japan) and BIG DAISHOWA SEIKI Co. LTD (Osaka, Japan).
"Hydro chuck" was invented by Masayuki Doi (Osaka, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hydro chuck includes a shank portion provided on one end side in a longitudinal direction and having, on a leading end side thereof, a cylindrical chuck portion for gripping a gripped object and an operational portion provided on the other end side in the longitudinal direction and disposed in continuation from the shank portion. The shank portion is fixable by being inserted to a tool mount included in a machine tool. The ...