Thursday, January 31, 2008

US Patent 7323432 - Auto exhaust purification using nanofilament array

This patent from Denso is at the intersection of nanotech and cleantech and includes some basic claims to nanofilaments for purifying automobile exhaust gas. Claim 1 reads:

1. An automobile exhaust gas purifying device comprising a catalyst assembly comprising a substrate, nanofilaments which have a nanometer-size diameter and are formed on the substrate, and particles which have a nanometer-size diameter of not more than approximately 100 nanometers, at least one of the nanofilaments and the particles having a catalytic function; wherein the nanofilaments extend from a surface of the substrate; and the particles are supported on the nanofilament.