ALEXANDRIA, Va., June 12 -- United States Patent no. 12,302,572, issued on May 13, was assigned to SAMSUNG ELECTRONICS CO LTD. (South Korea).
"Semiconductor memory device" was invented by So Hyeon Lee (Suwon-si, South Korea), Sung Su Moon (Hwaseong-si, South Korea), Jae Duk Lee (Seongnam-si, South Korea) and Ik-Hyung Joo (Seongnam-si, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "A semiconductor memory device includes; a first stacked structure including a first staircase portion, a second stacked structure on the first stacked structure and including a second staircase portion overlapping the first staircase portion, a first contact plug penetrating the first stacked structure and the second st...