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Method for purifying microbial polysaccharides: U S Patent 409473: Int.Cl.C 12 D 13 / 04 / S.W.Schroek: Eastlake, Ohaio, assignor to the Lubrizol Corporation, Wickliffe, Ohaio. -Filed: 27.12.76 , Ser.NN. 754866 ;