A cassette for use in a centrifugal counter-current distribution chromatographic apparatus which comprises a motor-driven rotor supported for rotation about a shaft having at least one pocket defined therein, and at least one cassette having a tortuous separation passage defined therein with the opposite...http://www.google.com/patents/US4968428?utm_source=gb-gplus-sharePatent US4968428 - Centrifugal counter-current distribution chromatography
