Description     Claims  

US5584293A   [0005] 
US6066608A   [0005]  [0007] 
US8772212B   [0006]  [0007] 
US5854293A   [0007] 
US5500152A   [0008] 
US8834903B   [0015]  [0015] 
US6541018B   [0015] 
US20030012759A1   [0016]