ALEXANDRIA, Va., June 17 -- United States Patent no. 12,313,484, issued on May 27, was assigned to AirFlow Direction Inc. (Amesbury, Mass.).
"Directional differential pressure detector" was invented by Brian M. Wiseman (Amesbury, Mass.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Methods and apparatuses for indicating the presence of a threshold directional differential pressure between separated adjacent spaces. An inclined conduit contains at least one movable element that indicates whether the pressure difference between the two spaces is at least as high as a threshold pressure difference. The apparatus may include an on-board pitch indicator and a roll indicator which are used together to calibrate th...