ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,442,389, issued on Oct. 14, was assigned to GM Global Technology Operations LLC (Detroit).
"Mill spindle fan" was invented by Colton Gruber (Royal Oak, Mich.) and Donald C. Grzebienik (Oxford, Mich.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A mill fan includes fan blades having a radially inner end and a radially outer end and an attachment sleeve having a radially inner surface and a radially outer surface. The radially inner surface includes a tool contact surface and the radially outer surface is in engagement with the radially inner ends of the fan blades. Them mill fan also includes an outer sleeve connecting the radially outer ends of the fan...