A plasma is produced in a treatment space by diffusing a plasma gas at atmospheric pressure and subjecting it to an electric field created by two metallic electrodes separated by a dielectric material, a vapor precursor is mixed with the plasma, and a substrate material is coated by vapor deposition...http://www.google.co.uk/patents/US6774018?utm_source=gb-gplus-sharePatent US6774018 - Barrier coatings produced by atmospheric glow discharge
