ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,471,748, issued on Nov. 18, was assigned to Nilfisk A/S (Copenhagen, Denmark).
"Debris basket indicator system" was invented by John Helgeson (Shoreview, Minn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method of detecting a fill level in a debris basket of a cleaning machine include steps of initiating a wet cleaning mode, measuring a pressure differential between a vacuum compartment and a recovery tank, and determining a fill level of a debris basket in response to the measured pressure differential. The cleaning machine includes a scrubbing element mounted to the cleaning machine and engageable with a cleaning surface, a squeegee disposed to c...