ALEXANDRIA, Va., April 21 -- United States Patent no. 12,605,774, issued on April 21, was assigned to Hougen Manufacturing Inc. (Swartz Creek, Mich.).
"Annular hole cutter" was invented by Jeffrey Steven Gill (Davison, Mich.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An annular hole cutter includes a cutter body having cutting teeth and a plurality of flutes extending from the cutting teeth around a side wall between a first and second end, with the flutes separated from each other by a land. The hole cutter includes side walls defining primary and secondary flutes with each one of the primary flutes defining first and second helix angles, and with each one of the secondary flutes defining a third helix ...