ALEXANDRIA, Va., June 12 -- United States Patent no. 12,295,539, issued on May 13, was assigned to Hilti AG (Schaan, Liechtenstein).
"Filter device for a vacuum cleaner and filter dedusting method" was invented by Oliver Ohlendorf (Landsberg, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A filter device for a vacuum cleaner. The filter device has two chambers, of which in each case at least one participates in suction operation of the vacuum cleaner, while a filter element of the other chamber can be dedusted. As a result, while one filter element is being dedusted, suction operation can be maintained through the other chamber of the vacuum cleaner. This advantage is allowed by an elastic membrane, ...