| 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} |
| 230 | DF | .~ FROM ALDEHYDE OR DERIVATIVE THEREOF AS REACTANT {12} |
| 248 | DF | .~.~ With heterocyclic reactant which is not an aldehyde or derivative {5} |
| 254 |  | .~.~.~ Nonaldehyde or nonaldehyde derivative heterocyclic reactant contains a six membered ring having three nitrogen and three carbon atoms as ring members {4} |
| 255 | DF | .~.~.~.~> Sulfur-containing heterocyclic compound having three nitrogen and three carbon atoms |
| 256 | DF | .~.~.~.~> With reactant containing >NC(=O)- or >N-C(=S)- group, e.g., urea, etc. |
| 257 | DF | .~.~.~.~> With reactant containing at least one noncyclic carbon atom bonded to at least three atoms of nitrogen, e.g., dicyanodiamide, etc. |
| 258 | DF | .~.~.~.~> Six-membered heterocycle is other than melamine per se or methylol derivative thereof |