 A research work published in 2007 concluded that the "Goebel-Defense" was fraudulent.After Göbel's death, in some countries, the legend arose he was the true inventor of the practical incandescent light bulb.Göbel acquired patents for an improvement of sewing machines (1865), for an improvement of the Geissler pump (1882) and for a technique to connect carbon threads to metal wires in incandescent lamps (1882).