Description  Claims  Drawing  Cited references 

US3211788A   [0011] 
GB959358A   [0012]  [0012] 
WO2011099844A   [0027] 
WO02090323A   [0038] 
EP2086928A   [0038] 
GB1542371A   [0039] 

Ullmann's Encyclopedia of Industrial Chemistry   [0013] 
Ullmann's Encyclopedia of Industrial Chemistry   [0028] 
Ullmann's Encyclopedia of Industrial Chemistry   [0036]