US Patent Issued to Hitachi on March 31 for "Rotating magnetic field generation device, magnetic refrigeration device, and hydrogen liquefaction device" (Japanese Inventor)

ALEXANDRIA, Va., March 31 -- United States Patent no. 12,590,739, issued on March 31, was assigned to Hitachi Ltd. (Tokyo).

"Rotating magnetic field generation device, magnetic refrigeration device, and hydrogen liquefaction device" was invented by Tsuyoshi Wakuda (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A rotating magnetic field generation device of the present invention includes: a magnetic field generating unit including disks in which a plurality of magnets are arranged circumferentially, a magnetic field working space formed by stacking the disks at intervals to make the plurality of magnets face each other, and a shaft to which the stacked disks are fixed, the shaft being installed at a ce...