ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,546,155, issued on Feb. 10, was assigned to LG Energy Solution Ltd. (Seoul, South Korea).
"Door descent preventing apparatus" was invented by Jung Soo Lee (Daejeon, South Korea).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a door descent preventing apparatus, and more particularly a door descent preventing apparatus mounted to a shaft installed at an inlet or an outlet of a chamber in a vertical direction in order to prevent descent of a door configured to be moved upwards and downwards along the shaft, the door descent preventing apparatus including a plurality of support bars, an upper fixing unit configured to connec...