Domenico Bernoco, Andre Mottu, Lothar Waltz: Apparatus and analysis for agglutination reaction. Hoffmann La Roche, Jon S Saxe, Bernard S Leon, Mark L Hopkins, April 10, 1979: US04148607 (37 worldwide citation)

Analysis of and apparatus for studying simple or complex agglutination reactions, such as for blood analysis and in particular blood groupings in which the specimen is mixed with at least one reagent in a vessel of predetermined shape and this mixture is incubated and thereafter centrifuged in this ...