The present invention provides a method for the acoustic ejection of fluid droplets from each of a plurality of fluid-containing reservoirs to prepare combinatorial libraries in the form of microarrays. An acoustic ejection device is used comprised of a plurality of fluid reservoirs, an ejector for generating...http://www.google.de/patents/US6612686?utm_source=gb-gplus-sharePatent US6612686 - Focused acoustic energy in the preparation and screening of combinatorial libraries
