The present invention provides centrifugal rotors for delivering a premeasured volume of liquid to a chamber in the rotor. In particular the rotors comprise siphons for delivering a premeasured volume of liquid between a first and a second chamber in the rotor. The siphons of the invention are designed...http://www.google.com.au/patents/US6752961?utm_source=gb-gplus-sharePatent US6752961 - Modified siphons for improving metering precision
