Tuesday, August 19, 2008

US Patent 7413550 - Bad breath detector using nanoparticles


This patent from Kimberly-Clark Worldwide teaches using silica or alumina nanoparticles in a high sensitivity bad breadth testing device. Claim 1 reads:

1. A breath testing device comprising nanoparticles and a visual indicating agent disposed on a substrate, wherein the visual indicating agent is color sensitive to at least one odorous compound present in the breath of a user, wherein the visual indicating agent is 4,4′-bis(dimethylamino)-benzhydrol.