An osmotic system is disclosed for dispensing a beneficial agent. The system comprises (1) a first wall of a semipermeable material that surrounds a compartment containing a drug formulation, and has a passageway through the wall for releasing agent from the compartment, (2) a second wall positioned...http://www.google.es/patents/US4285987?utm_source=gb-gplus-sharePatente US4285987 - Process for manufacturing device with dispersion zone
Process for manufacturing device with dispersion zone
