The present invention provides a centrifugal rotor which measures and delivers a predetermined volume of fluid to a receiving chamber in the rotor. The rotor comprises a bulk fluid chamber containing a bulk amount of fluid and a metering chamber which has a predetermined volume. The bulk fluid flowing...http://www.google.fr/patents/US5173193?utm_source=gb-gplus-shareBrevet US5173193 - Centrifugal rotor having flow partition
