| 528 / | HD | SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES |
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| * | DD | SYNTHETIC RESINS (Class 520, Subclass 1) {23} |
| 271 | DF | .~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10} |
| 310 | DF | .~.~ From imide- or lactam-containing compound, or from an amino-nitrogen containing carboxylic acid, or derivative of an amino-nitrogen-containing carboxylic acid {9} |
| 323 |  | .~.~.~ Lactam-containing reactant {3} |
| 324 | DF | .~.~.~.~> With two or more reactants one of which is a carboxylic acid or derivative and one of which is an organic compound containing at least two amino nitrogen atoms |
| 325 | DF | .~.~.~.~> Two or more lactam reactant or with an amino-containing carboxylic acid or derivative of an amino-containing carboxylic acid |
| 326 | DF | .~.~.~.~> Lactam reactant contains 3-5 or 12 or more carbon atoms in the lactam ring |