ALEXANDRIA, Va., Nov. 11 -- United States Patent no. 12,466,131, issued on Nov. 11, was assigned to Freemelt AB (Molndal, Sweden).
"Preheating of powder bed" was invented by Ulf Ackelid (Gothenburg, Sweden).
According to the abstract* released by the U.S. Patent & Trademark Office: "An arrangement for additive manufacturing by selective fusion of layers of a three-dimensional product from a powder bed including successively formed powder layers is provided. The arrangement includes a heating element having a powder layer facing surface, arranged in a powder layer heating position above a powder layer, in such a way that heat radiation emitted from said heating element heats at least a part of the powder layer before the selective fusion o...