ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,442,378, issued on Oct. 14, was assigned to MDGROUP Germany GmbH (Siegen, Germany).
"Impeller and method for operating an impeller" was invented by Daniel Schubeler (Siegen, Germany) and Sven Meerkotter (Siegen, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method for operating an impeller, in the case of which method the impeller comprises an impeller housing (15) and a motor housing (19) which is arranged in the impeller housing. A motor (16) is arranged in an interior space (36, 38) of the motor housing (19), wherein an impeller rotor (14) is driven by way of the motor (16), in order to generate an air stream along an annular chamber (31) ...