ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,428,897, issued on Sept. 30, was assigned to Assa Abloy Entrance Systems AB (Landskrona, Sweden).
"Sectional door operator system" was invented by Daniel Eliasson (Lund, Sweden), Magnus Abrahamsson (Loddekopinge, Sweden), Johan Kjessler (Lund, Sweden), Anton Hansson (Kivik, Sweden) and Dennis Melin (Ytterby, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "A sectional door operator system for opening and closing an opening comprises a door moved between open (O) and closed (C) positions and formed by horizontal and interconnected sections. The door is connected with a door frame with frame sections on opposite sides of the opening. A drive unit sy...