| 528 / | HD | SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES |
| * | DD | SYNTHETIC RESINS (Class 520, Subclass 1) {23} |
| 86 | DF | .~ FROM PHENOL, PHENOL ETHER, OR INORGANIC PHENOLATE {15} |
| 87 | DF | .~.~ From 1,2-epoxy-containing phenolic reactant or with 1,2-epoxy-containing reactant {12} |
| 88 | DF | .~.~.~ Polymerizing in the presence of a specified material other than reactant {6} |
| 93 | | .~.~.~.~ Material contains a nitrogen compound {1} |
| 94 | DF | .~.~.~.~.~> Nitrogen material contains a nitrogen atom as part of a heterocyclic ring |