US Patent 7911336 - Nanosensor container monitoring

http://www.freepatentsonline.com/7911336.html

This patent deals with the problem of detecting explosives or biotech threats from cargo containers by using resonating nanosensors. Claim 1 reads:

1. A detection system for an enclosed container, comprising:

many nanosensors for detecting materials harmful to human beings within an enclosed container and transmitting a corresponding resonance frequency; and

at least one detection device which detects a condition of the nanosensors and outputs a signal responsive thereto.