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US2834748A   [0026] 
US2917480A   [0026] 
US2846458A   [0026] 
US6516837B   [0090] 
US7428816B   [0098] 
US6589355B   [0104] 

Ind. Eng. Chem. Process Des. Dev.   [0017] 
Polyurethanes Chemistry and Technology   [0066] 
Anesthesiology   [0125]