ALEXANDRIA, Va., Aug. 6 -- United States Patent no. 12,378,974, issued on Aug. 5.
"Damper for fan" was invented by Fulvio Brambilla (Sanremo, Italy).
According to the abstract* released by the U.S. Patent & Trademark Office: "A damper for fan includes a frame (61) defining a passage for an airflow, having an inlet and an outlet, and a pair of flaps (62, 63) hinged to the frame (61) about respective rotation axes (x1, x2) parallel to each other, the flaps being rotatable between an open and a closed position, for opening and closing the passage, respectively. Each of the flaps includes a concave portion (62c, 63c) and a convex portion (62d, 63d) arranged on opposite axial halves of the respective flap, wherein in the closed position the co...