US Patent 7295503 - Electron emitting nanotubes for data storage

http://www.freepatentsonline.com/7295503.html

One of the key properties of carbon nanotubes that is being exploited in proposed commercial devices is their capacity for high electron emission with low threshold voltages. This is one of a group of related patents to Hewlett Packard which capture the use of such field emission nanotube arrays for data storage. Claim 1 reads:

1. A data storage device comprising an array of nanotubes as electron field emission sources.