ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,769, issued on Nov. 18, was assigned to PowerLift Door Consultants Inc. (Lake Benton, Minn.).
"Bi-fold overhead door with concealed hydraulic cylinder" was invented by Richard Ernest Peterson (Lake Benton, Minn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A bi-fold overhead door system including a door frame, an overhead door and a hydraulic cylinder. The frame and the overhead door have corresponding slots formed therein. A top member of the door is pivotally mounted to the door frame. The hydraulic cylinder includes a first cylinder end and a second cylinder end. The first cylinder end is operably attached to the frame. The second cylinder end ...