ALEXANDRIA, Va., June 10 -- United States Patent no. 12,292,188, issued on May 6, was assigned to RINNAI Corp. (Aichi, Japan).
"Premixing apparatus" was invented by Katsuya Noritake (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, supplies an air-fuel mixture to a burner through a fan, and carries out a control that regulates an opening degree of a variable throttle valve, which is interposed in a gas supply passage, so that an excess air ratio of an air-fuel mixture becomes an appropriate value, in a case where a detected excess air ratio deviates to one side, e.g., a large side, from an acceptable range, a motor is repeatedly caused to ro...