ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,540,778, issued on Feb. 3, was assigned to RINNAI Corp. (Aichi, Japan).
"Heat exchanger" was invented by Kei Kasamatsu (Aichi, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "In a heat exchanger that includes heat-absorbing fins and heat-absorbing tubes, each of which pierces through a corresponding through hole formed by a burring process, when a brazing material held by each of brazing material holding portions is positioned above a corresponding missing portion, formed by removing a part of a burring wall of each of the through holes, melts and penetrates between each of the burring walls and the corresponding heat-absorbing tube, each of the bra...