An anti-fog element includes a transparent substrate such as a glass substrate, a transparent film of a photocatalyzer such as TiO.sub.2 catalyzing a photocatalytic reaction on the transparent substrate, and a film of a transparent porous inorganic oxide such as SiO.sub.2 formed on the film...http://www.google.fr/patents/US5854708?utm_source=gb-gplus-shareBrevet US5854708 - Anti-fog element
