A heterogeneous binding assay in which a liquid component and a granular particulate solid phase are incubated together for a predetermined period of time. To prevent unwanted unit gravity sedimentation of the granular particulate solid phase during incubation the density of the liquid component is controlled...http://www.google.com/patents/US4656143?utm_source=gb-gplus-sharePatent US4656143 - Heterogeneous binding assay
