US Patent 7615111 - Silver nanoparticle inkjet ink

http://www.freepatentsonline.com/7615111.html

Inkjet printing tools have been experimented with over the past few years as a mechanism to print nanoparticle based patterns for fabricating devices such as RFID tags or electronic displays. This patent from HP has priority to 2007 and includes some basic claims toward silver nanoparticle inkjet ink. Claim 1 reads:

1. A metallic inkjet ink, comprising:

a silver metallic pigment, a water-based dispersion of silver nanoparticles, or combinations thereof;

an other colorant selected from a pigment, a dye, and combinations thereof; and

at least one ink vehicle.


One piece of prior art which may be relevant to the claims is the article "Inkjet printing of nanosized silver colloids" published in the journal Nanotechnology in 2005.