US Patent 7640936 - Nanoscale catalysts for cigarette CO reduction

http://www.freepatentsonline.com/7640936.html

This patent is from Philip Morris and teaches metal oxide nanocatalysts for reducing carbon monoxide in cigarette smoke. Claim 1 reads:

1. A component of a smoking article comprising a multiphase mixed metal oxide catalyst consisting of sintered nanoparticles of at least two metal oxides selected from the group consisting of copper oxide, cerium oxide, titanium oxide and iron oxide, wherein the component is selected from the group consisting of tobacco cut filler, cigarette paper and cigarette filter material.