CPC Main Group B27K 3/00 Impregnating wood, (dyeing, staining B27K5/00) 7 direct subcodes Child Classifications Navigate with arrow keys, Enter to open B27K 3/002 B27K 3/005 B27K 3/007 B27K 3/02 Processes; Apparatus B27K 3/16 Inorganic impregnating agents B27K 3/34 Organic impregnating agents B27K 3/52 Impregnating agents containing mixtures of inorganic and organic compounds