US Patent Issued on May 19 for "Crematory vacuum cleaner" (Wisconsin Inventor)

ALEXANDRIA, Va., May 19 -- United States Patent no. 12,631,328, issued on May 19.

"Crematory vacuum cleaner" was invented by John J. Buettgen (Schofield, Wis.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A vacuum cleaner for use in cleaning very hot crematory ovens has a suction head mounted on side wheels, and connected to a central fitting which receives compressed air through a stiff metal air supply pipe. An expansion pipe extends upwardly from the central fitting and is tipped frontwardly. The compressed air passes through the central fitting which incorporates a vacuum eductor which draws air flow in from the vacuum head. The hot air discharges through a filter cap at the upper end of the expansion p...