A system for supplying fluid for a fluid flow transfer device and achieving target ultrafiltration fluid losses by automatically, periodically monitoring the ultrafiltration rate and transmembrane pressure, computing the transmembrane pressure necessary to achieve the target fluid loss by the end of...http://www.google.es/patents/US4381999?utm_source=gb-gplus-sharePatente US4381999 - Automatic ultrafiltration control system
