EcoloBlue's patent number
The machine is Designed in California, but Assembled (manufactured) in China. Also, granted a patent in 2011 which possesses an U.S. patent number: 7,861,544. It is patented in other countries as well.
You may also read more about the technology by visiting the link: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7,861,544.PN.&OS=PN/7,861,544&RS=PN/7,861,544