An ambient sensing device is described especially suited to the sensing of a variety of ambient parameters. Photolithographic techniques are used to pattern a multiplicity of sensitive layers on a single monolithic substrate taking into account the wide range of plastic, gelatinous and ceramic materials...http://www.google.es/patents/US4739380?utm_source=gb-gplus-sharePatente US4739380 - Integrated ambient sensing devices and methods of manufacture
Integrated ambient sensing devices and methods of manufacture