Patent application: http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PG01&s1

Patent application: http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PG01&s1=20090097671.PGNR.&OS=DN/20090097671&RS=DN/20090097671 http://appft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Se... Laymen's writeup: http://www.newscientist.com/article/mg20227075.700-cone-of-silence-keeps-conversations-secret.html?full=true&print=true http://www.newscientist.com/article/mg20227075.700-cone-of-s...