We do not own a patent on this PAPR. But it is simple to make. It is effective. 100% HEPA filtered air on this powered air purifier with over 3h of autonomy on quick charge battery. The device is light and relatively quiet. We can make different hoods, or sell the blower alone. The complete set comes with battery and charger. We can entertain large orders. On site service can also be discussed if needed.