Crystalline spherical inhalation particles incorporating a combination of two or more different active ingredients and a process for the preparation thereof. The particles have a narrow particle size distribution, rough surfaces and improved stability. The inhalation particles of the invention are particularly...http://www.google.de/patents/US7267813?utm_source=gb-gplus-sharePatent US7267813 - Inhalation particles incorporating a combination of two or more active ingredients
