ALEXANDRIA, Va., June 5 -- United States Patent no. 12,276,421, issued on April 15, was assigned to NORITZ Corp. (Hyogo, Japan).
"Collective exhaust system" was invented by Takahide Hasegawa (Kakogawa, Japan) and Atsushi Ushio (Akashi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The disclosure provides a collective exhaust system capable of safely detecting a closing failure of a check valve of the collective exhaust system. The collective exhaust system includes: multiple combustion devices including blowing parts and exhaust pipes; a collective exhaust duct to which the exhaust pipes of the multiple combustion devices are respectively connected; and check valves respectively provided between the e...