US Patent 7736209 - Nanoparticle screen printing

http://www.freepatentsonline.com/7736209.html

Screen printing is a common technique used in printing on textile objects such as T-shirts or printing on materials such as metals and wood which are incompatible with other printing methods. More recently screen printing has been used to pattern electronic structures. This patent from Applied Nanotech teaches one way of applying screen printing for patterning nanoparticles used in creating CNT field emitters. Claim 1 reads:

1. A method for forming a field emission cathode device comprising the step of depositing a surface layer of nanoparticles-material on a substrate such that said surface layer of nanoparticles-material forms a plurality of field emitting islands that are physically isolated from each other, wherein the nanoparticle-material is deposited using a 355-mesh screen having a mesh opening of about 25-30 microns wide.