Patent ID: 7927554

Claim:
An air purifier comprising: an air flow cavity bounded by cavity walls; a source of ultraviolet light for emitting ultraviolet light such that ultraviolet light is present within said cavity; an ultraviolet light reflective coating on a surface area of said cavity walls and a plurality of photocatalytic particles on said surface area of said cavity walls; said coating completely covering said surface area, said photocatalytic particles covering no more than 5.0% of said surface area so as to not materially affect UV reflectance of said coating; said photocatalytic particles being of a type which leads to production of oxygen and hydroxyl free radicals when illuminated with ultraviolet light in the presence of water; a dielectric body which is porous to air and transmissive to ultraviolet light interposed across an air flow path within said cavity; and an anode and cathode in said dielectric body.