US Patent Issued on Sept. 15 for "High-security self-rising access frame door" (New York Inventor)

ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,735,931, issued on Sept. 15.

"High-security self-rising access frame door" was invented by David Reisender (Ellenville, N.Y.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A closure system for the access opening in a barrier to an enclosed space for confining individuals. The closure system has a rear frame plate, a front frame plate, middle spacer plates and a sliding door slidable between the frame plates to move between an open position and a closed position closing off the access opening. One or more door springs configured to bias the sliding door towards a partially open position, when the sliding door is unlocked by an associated locking mechani...