Patent ID: 7527832

Claim:
A process for forming a hydrophobic micro-rough outer surface of an inorganic material on a glass substrate, the process comprising: providing a glass substrate; forming a first layer on the glass substrate by plasma spraying particles of inorganic oxide material having an average diameter greater than 0.2 microns but less than 100 microns using a plasma gas arc flame at a temperature of about 7,000 K to about 20,000 K; forming a second layer on the first layer by plasma spraying particles of inorganic material having an average diameter that is less than half of the average diameter of the particles forming the first layer, using a plasma gas arc flame at a temperature of about 7,000 K to about 20,000 K; whereby the outer surface of the second layer that is formed is hydrophobic, micro-rough and exhibits a self-cleaning property.