EUROPEAN PATENT FOR INJECTOR NOZZLES Specially Developed Ejectors The Nivis series snow generators need neither compressors nor the traditional nucleators. The specially developed Nivis ejectors are protected by European patent Nr. 1456588. NIVIS’ PHILOSOPHY The Energy Savers! These systems patented by Nivis use the pressure force which exists in the water, thereby contributing to energy and weight savings, as well as a decrease in noise and maintenance. Read more about the Nivis philosophy.