Patent ID: 7789949

Claim:
A getter device comprising: a substrate formed of a first getter material having a composition for gettering a first gas species, the substrate comprising an external surface and internal porosity connected to openings at the external surface; and a second getter material deposited by a film deposition process on the external surface of the substrate so as to form an exposed film that adheres to the external surface, the second getter material having a composition for gettering a second gas species different from the first gas species, the film of the second getter material covering at least a portion of the external surface of the substrate and being absent from at least a portion of the internal porosity of the substrate so that the first getter material is exposed within the internal porosity of the substrate for gettering the first gas species within the internal porosity and the second getter material is exposed on the external surface of the substrate for gettering the second gas species at the external surface of the substrate.