Caselli applied in 1861 for a patent for his pantélégraphe in Europe and ultimately received European Patent #2532 for the device. He applied for a patent in 1863 in the United States and it received patent number 37,563. Caselli successfully demonstrated his pantelegraph in 1861 at the Florence Exhibition to an audience which had the King of Italy, King Victor Emmanuel. Napoleon awarded Caselli the Legion of Honor because his pantelegraph was successful from the beginning. Parisian scientists and engineers started the Pantelegraph Society to share ideas and concepts about the pantelegraph.