Wednesday, March 12, 2008

US Patent 7341734 - Skin or hair care products formed using semiconductor nanocrystals

There is some controversy over the use of nanostructured material in products designed to interact with bioorganisms. However, there are a large variety of such products available such as sunscreens and cosmetics. This patent from Evident technologies presents some basic claims to the use of semiconductor nanocrystals such as ZnO in such products. Claim 1 reads:

1. A personal care composition comprising: a personal care ingredient; and a semiconductor nanocrystal dispersed or dissolved in the personal care ingredient, the semiconductor nanocrystal having a diameter between one and twenty nanometers.

However, some prior art may have been overlooked during the examination such as US 6403653 or US 2005/0265935.