Description  Claims  Cited references 

US4948669A   [0005] 
US4430468A   [0005] 
US4434258A   [0005] 
US4673620A   [0005] 
US4701359A   [0005] 
US6475628B   [0005] 
US20050137306   [0005] 
US2003049002A1   [0007] 
US7446140B2   [0008] 
US6451894B   [0016] 
US6376623B   [0016] 
US6329454B   [0016] 
US6414070B   [0027] 
WO0066657A   [0027] 
WO0068312A   [0027]