ALEXANDRIA, Va., April 21 -- United States Patent no. 12,605,900, issued on April 21, was assigned to Stratasys Powder Production Ltd. (Nottingham, Great Britain).

"Extraction system for apparatus for the layer-by-layer formation of three-dimensional objects, and associated methods and controller" was invented by Marcel Garrido Barrabes (London) and Anders Hartmann (London).

According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus for the layer-by-layer formation of three-dimensional objects, the apparatus comprising a gas extraction system and an enclosed working space from which gas is to be extracted, wherein the working space is enclosed by side walls, a ceiling and a working surface, and comprises a wo...