ALEXANDRIA, Va., July 21 -- United States Patent no. 12,687,343, issued on July 21, was assigned to DANFOSS A/S (Nordborg, Denmark).
"Double plate heat exchanger" was invented by Helge Nielsen (Sydals, Denmark).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention relates to a plate element (2) having a first heat transfer plate (10) and a second heat transfer plate (20), the first heat transfer plate (10) and the second heat transfer plate (20) being connected to each other to form the plate element (2). Each of the first heat transfer plate (10) and the second heat transfer plate (20) is formed of a plate body with a main part with a heat exchanging portion (40) formed with a surface pattern ...