ALEXANDRIA, Va., June 16 -- United States Patent no. 12,305,376, issued on May 20, was assigned to Xmark SP LLC (Nampa, Idaho).
"Air admittance valve" was invented by Daniel L. McCoy (Nampa, Idaho).
According to the abstract* released by the U.S. Patent & Trademark Office: "An air admittance valve that includes a base, a flow control member, a diaphragm, and a cap. The base is open at its ends and includes an interior, an exterior, and a sidewall with at least a first port in the sidewall. The flow control member extends transverse across the interior of the base and includes a cavity aligned and in communication with the first port. The flow control member includes a central opening in the top side that is in communication with the cavit...