A system for preventing overflow of a toilet includes a sensor, a processor and an actuator. The sensor senses a parameter caused by fluid dynamics within the toilet during a flush cycle. The parameter may involve vibration, sound, pressure, fluid flow rate or other detectible characteristics of the...http://www.google.es/patents/US7636959?utm_source=gb-gplus-sharePatente US7636959 - Toilet overflow prevention system and method
