Description     Claims  

US4985210A   [0004]  [0004] 
US5051244A   [0005]  [0005] 
US920847A   [0005] 
US5125231A   [0006] 
US5158753A   [0007] 
US6171556B   [0008]  [0027]  [0042] 
WO9711769A   [0008] 
US20020043156A1   [0009] 
EP1110593A1   [0010] 
CN1059701A   [0032]