-
-
-
-
-
3437613
-
Patent number 3,437,613
-
Issue date Apr 8, 1969
-
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
-
2809948
-
Patent number 2,809,948
-
Issue date Oct 15, 1957
-
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...