US Patent 7492046 - CNT electric fuses

http://www.freepatentsonline.com/7492046.html

This patent from IBM teaches providing nanotubes of different length in a reprogrammable fuse method. Claim 1 reads:

12. A structure operating method, comprising:

providing a structure which includes

(a) an electrically conductive layer,

(b) N electrically conductive regions hanging over without touching the electrically conductive layer, wherein N is a positive integer and N is greater than 1, wherein the N electrically conductive regions are electrically connected together; and causing a first electrically conductive region of the N electrically conductive regions to touch the electrically conductive layer without causing the remaining N−1 electrically conductive regions to touch the electrically conductive layer.