ALEXANDRIA, Va., Sept. 10 -- United States Patent no. 12,410,656, issued on Sept. 9, was assigned to FRINOVA GMBH (Pansdorf, Germany).
"Quick-action roll-up door" was invented by Wilhelm Duck (Lubeck, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A quick-action roll-up door (1) for a cold storage room has a flexible door panel (5), which is windable onto a horizontal shaft (4) in a vertical running direction for purposes of closing a door opening (2) bounded by a door frame (3). A winding drive (6) opens and closes the door, together with a pressure application frame (8), subjecting the door panel in a closing position to force, transverse to a planar face of the door panel, in the direction of the ...