The present invention provides a method and apparatus for dispensing small volumes of selected substances, such as biological reagents or samples, onto substrates. According to one general embodiment, a plurality of spaced, tandemly-arranged substrates are advanced, e.g., by way of a conveyor, along...http://www.google.ca/patents/US6355487?utm_source=gb-gplus-sharePatent US6355487 - Apparatus and method for transferring small volumes of substances
