Description  Claims  Drawing  Cited references 

US7239901B   [0004] 
US2009076354A1   [0006]  [0006] 
WO2012135079A1   [0007] 
US2006217608A1   [0008] 
US5879294A   [0009] 
US5348003A   [0010] 
US6678541B1   [0011] 
US20110102791A   [0023]