Methods of controlling fluid flow through microchannels by use of passive valves or stopping means in the microchannels is presented. The passive valves act as pressure barriers impeding flow of solution past the stopping means until enough force is built up to overcome the force of the pressure barrier....http://www.google.com.au/patents/US6601613?utm_source=gb-gplus-sharePatent US6601613 - Fluid circuit components based upon passive fluid dynamics
