ALEXANDRIA, Va., June 12 -- United States Patent no. 12,297,739, issued on May 13, was assigned to Valeo Powertrain GmbH (Ebern, Germany).
"Rotary vane pump" was invented by Roland Stoessel (Ebern, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A rotary vane pump includes a pump housing, a stator, a rotor, a plurality of vanes which are accommodated in the rotor so as to be displaceable in the radial direction, so that they delimit a plurality of pump chambers between themselves, the stator and the rotor. A radially inner cam surface is provided, against which the vanes rest, wherein secondary chambers are delimited in the radial direction between the cam surface and the rotor and in the circumferent...