Vitalizer Plus's patent number
The machine is Made in Korea, but Assembled in USA. Also, granted a patent in 2005 which possesses an U.S. patent number: 6,783,664. It is patented in other countries as well.
You may also read more about the technology by visiting the link: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=1&f=G&l=50&d=PG01&S1=6,783,664&OS=6,783,664&RS=6,783,664