Disclosed is a method for preparing sustained release microparticles which release a physiologically active substance for long periods of time. The sustained release microparticles are prepared through a multi-emulsion process. A drug of interest is dissolved or dispersed in each of at least two oils...http://www.google.com/patents/US6506410?utm_source=gb-gplus-sharePatent US6506410 - Sustained release microparticle and method for preparing the same
