ALEXANDRIA, Va., Oct. 8 -- United States Patent no. 12,439,601, issued on Oct. 7, was assigned to SK hynix Inc. (Icheon-si, South Korea).

"Semiconductor memory device and manufacturing method of the semiconductor memory device" was invented by Nam Jae Lee (Icheon-si, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "There are provided a semiconductor memory device and a manufacturing method of the semiconductor memory device. The semiconductor device includes: a first stack structure including interlayer insulating layers and first conductive patterns, which are alternately stacked; a second stack structure including a second conductive pattern overlapping with the first stack structure, and a third...