Description  Claims  Cited references 

WO2006110234A   [0005]  [0005] 
USP4298718A   [0021] 
USP4495338A   [0021] 
USP4220554A   [0023] 
USP4399054A   [0024] 
USP4469648A   [0024] 
EP395083A   [0024] 
EP553805A   [0024] 
EP553806A   [0024] 
EP601525A   [0024] 
WO9844009A   [0024]  [0043]