| 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} |
| 308 | DF | .~.~.~ Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acid {2} |
| 308.1 | DF | .~.~.~.~ Polyethylene Terephthalate per se {2} |
| 308.3 | DF | .~.~.~.~.~ Processes of preparing {2} |
| 308.4 |  | .~.~.~.~.~.~ In presence of hydrocarbon, steam or water |