ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,551,639, issued on Feb. 17.
"Respiratory flow sensor" was invented by Harri Friberg (Mauren, Liechtenstein) and Jakob Daescher (Flasch, Switzerland).
According to the abstract* released by the U.S. Patent & Trademark Office: "The invention relates to a respiratory flow sensor comprising a flow pipe, which has a flow channel and, on the free ends thereof, hose connections for hoses, comprising a cover flap, which is arranged in the flow channel and divides the flow channel into a first flow channel portion and into a second flow channel portion, and comprising connections, which lead into the flow channel on both sides of the cover flap and serve for the reduction of the differential ...