An osmotic system is disclosed for delivering a beneficial agent formulation to an environment of use. The osmotic system comprises (a) an outside semipermeable wall, (b) a middle osmotically active layer, (c) a capsule comprising a beneficial agent, and (d) a passageway for dispensing the beneficial...http://www.google.com.au/patents/US5413572?utm_source=gb-gplus-sharePatent US5413572 - Osmotic dosage system for liquid drug delivery
