The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 2007
Filed:
May. 30, 2003
Di Wei, Manchester, CT (US);
Timothy N. Obee, South Windsor, CT (US);
Stephen O. Hay, South Windsor, CT (US);
Thomas H. Vanderspurt, Glastonbury, CT (US);
Wayde R. Schmidt, Pomfret Center, CT (US);
Joseph J. Sangiovanni, West Suffield, CT (US);
Di Wei, Manchester, CT (US);
Timothy N. Obee, South Windsor, CT (US);
Stephen O. Hay, South Windsor, CT (US);
Thomas H. Vanderspurt, Glastonbury, CT (US);
Wayde R. Schmidt, Pomfret Center, CT (US);
Joseph J. Sangiovanni, West Suffield, CT (US);
Carrier Corporation, Syracuse, NY (US);
Abstract
A tungsten oxide/titanium dioxide photocatalyst coating oxidizes contaminants in the air that adsorb onto the coating into water, carbon dioxide, and other substances. The tungsten oxide forms a monolayer on the titanium dioxide. When photons of the ultraviolet light are absorbed by the tungsten oxide/titanium dioxide photocatalyst coating, an electron is promoted from the valence band to the conduction band, producing a hole in the valence band. The holes in the valence band react with water applied on the tungsten oxide/titanium dioxide photocatalyst coating, forming reactive hydroxyl radicals. When a contaminant in the air is adsorbed onto the tungsten oxide/titanium dioxide photocatalyst, the hydroxyl radical attacks the contaminant, abstracting a hydrogen atom from the contaminant. The hydroxyl radical oxidizes the contaminant, producing water, carbon dioxide, and other substances. The tungsten oxide/titanium dioxide photocatalytic coating has low sensitivity to humidity variations.