Graded photocatalytic coatings
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United States of America Patent
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Nov 13, 2007
Grant Date -
Jun 23, 2005
app pub date -
Dec 22, 2004
filing date -
Dec 22, 2003
priority date (Note) -
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Abstract
The invention provides graded photocatalytic coatings. In one aspect, the invention provides a substrate carrying a photocatalytic coating that includes a first graded film region and a second graded film region. The first graded film region has a substantially continuously decreasing concentration of a first transparent dielectric material and a substantially continuously increasing concentration of a second transparent dielectric material. The second graded film region has a substantially continuously decreasing concentration of the second transparent dielectric material and a substantially continuously increasing concentration of a third transparent dielectric material. In certain embodiments, the first transparent dielectric material comprises silicon dioxide, the second transparent dielectric material comprises zirconium oxide, and the third transparent dielectric material comprises titanium oxide. The invention also provides methods and equipment for depositing graded photocatalytic coatings.
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