A device has a first surface. A second surface is offset from a first surface to form a package. At least one movable element is within the package having a movable surface to contact another surface. An environmental control material is included inside the package to affect an operation of the movable...http://www.google.de/patents/US20050247477?utm_source=gb-gplus-sharePatent US20050247477 - Modifying the electro-mechanical behavior of devices
