@patent {28175,
	title = {Device for powdering printed sheets in a printing press, and printing press with a powdering device},
	volume = {13191957},
	year = {2012},
	edition = {United States of America},
	chapter = {US},
	url = {https://patents.google.com/patent/US20120024175A1/en},
	author = {Claudius Haas}
}