A method and apparatus for selectively sintering a layer of powder to produce a part as a plurality of sintered layers. The apparatus includes a computer controlling a laser to direct the laser energy onto the powder to produce a sintered mass. The computer either determines or is programmed with the...http://www.google.fr/patents/US5639070?utm_source=gb-gplus-shareBrevet US5639070 - Method for producing parts by selective sintering
