The present invention provides a design of an apparatus that controllably generates plurality of fountains or fog. The apparatus comprises of a plurality of concave focused transducers that are immersed in a fluid with the focus located at the fluid surface. The apparatus is further comprises of a function...http://www.google.se/patents/US6935760?utm_source=gb-gplus-sharePatent US6935760 - Ultrasonically induced plumbing-free controllable plurality of fountains and fog (ULIFOG)
