ALEXANDRIA, Va., May 1 -- United States Patent no. 11,969,743, issued on April 30.
"Dispenser with ventilation filter" was invented by Friedrich Fischer (Wimsheim, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A dispenser system for a pumpable dispensed product, in particular a cosmetic fluid dispensed product such as a washing lotion, a cream lotion, a perfume liquid or similar includes a rigid or pliable product container and a dispensing device with a pump apparatus. The pump apparatus includes at least one first valve group for conveying the dispensed product out of the product container. The pump apparatus includes a second valve group for feeding air into the product container, wherein the sec...