ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,467,624, issued on Nov. 11, was assigned to RINNAI Corp. (Aichi, Japan).
"Premixing apparatus" was invented by Katsuya Noritake (Aichi, Japan) and Takuya Miura (Aichi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "In a premixing apparatus that mixes a fuel gas with air and supplies an air-fuel mixture to a burner through a fan, includes a main valve, a zero governor, and a variable throttle valve which are interposed from an upstream side downward in sequence in a gas supply passage, of which an downstream end is connected to a gas suction part that is provided in an air supply passage on an upstream side of a fan, and carries out a first control...