| 528 / | HD | SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES |
| * | DD | SYNTHETIC RESINS (Class 520, Subclass 1) {23} |
| 271 | DF | .~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10} |
| 354 | DF | .~.~ From compound having -C-C(=O)-O-C- group as part of a heterocyclic ring, e.g., lactone, etc. {2} |
| 355 | DF | .~.~.~ Polymerizing in the presence of a specified material other than a reactant {2} |
| 356 | | .~.~.~.~ Material contains a phosphorus or sulfur atom |