The related patents: http://www.google.com/patents/US8185551 http://www.google.com/patents/US8185551 http://www.google.com/patents/US8489638 http://www.google.

The related patents: http://www.google.com/patents/US8185551 http://www.google.com/patents/US8185551 http://www.google.com/patents/US8489638 http://www.google.com/patents/US8489638