Dermal patches containing a flexible, crosslinked, polymeric gel comprising polyvinyl alcohol and a crosslinking agent comprising a multivalent element, e.g., titanium complexed with hydroxyalkyl amines, are disclosed. The dermal patches can be used to deliver pharmaceutically active agents to the dermal...http://www.google.com.au/patents/US5547681?utm_source=gb-gplus-sharePatent US5547681 - Dermal patch
