Devices are provided for the controlled exposure or release of contents stored in hermetically sealed reservoirs. The devices comprise a primary substrate having a front side and a back side, and including one or more hermetic sealing materials; a plurality of reservoirs in the primary substrate positioned...http://www.google.co.uk/patents/US7497846?utm_source=gb-gplus-sharePatent US7497846 - Hermetically sealed microchip reservoir devices
