| 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} |
| 272 | DF | .~.~ From di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereof {15} |
| 274 | DF | .~.~.~ Polymerizing in the presence of a specified material other than reactant {2} |
| 275 | DF | .~.~.~.~ Material contains a metal atom {6} |
| 277 |  | .~.~.~.~.~ Material contains a transition metal atom {3} |
| 278 | DF | .~.~.~.~.~.~> Metal atom has atomic number of 57-71, or 89 and higher |
| 279 | DF | .~.~.~.~.~.~> Material contains a Group IVB metal atom (Ti, Zr, Hf) |
| 280 | DF | .~.~.~.~.~.~> Material contains a Group VIII metal atom (Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, Pt) |