ALEXANDRIA, Va., May 26 -- United States Patent no. 12,640,421, issued on May 26, was assigned to PRIME PLANET ENERGY & SOLUTIONS INC. (Tokyo).
"Power storage device and producing method therefor" was invented by Atsushi Miyazaki (Himeji, Japan), Shingo Yamane (Nagakute, Japan) and Kohji Umemura (Ono, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A power storage device includes a lid of a case housing an electrode body and a stopper welded to a liquid inlet circumferential portion of the lid by energy-beam welding to seal the liquid inlet. An annular solidified molten portion made of metal, which has been once molten and then solidified, is positioned on a lid thickwise inside than a lid outer plane o...