ALEXANDRIA, Va., July 15 -- United States Patent no. 12,663,166, issued on June 23, was assigned to NORITZ Corp. (Hyogo, Japan).
"Hot water circulation device and hot water device monitoring system" was invented by Nobuaki Matsui (Hyogo, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The disclosure includes a hot water circulation device, and a hot water device monitoring system including a circulation passage; a circulation pump circulating hot water in the circulation passage; a closed expansion tank in which a water chamber communicating with the circulation passage and an air chamber filled with a predetermined pressure in initial state are partitioned by a diaphragm; and a control unit controlling...