| 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} |
| 129 | DF | .~.~ With aldehyde or derivative {18} |
| 137 | DF | .~.~.~ Polymerizing in the presence of a specified material other than a reactant {9} |
| 145 | | .~.~.~.~ Material contains a nitrogen compound {1} |
| 146 | DF | .~.~.~.~.~> Nitrogen-containing material contains a nitrogen atom directly bonded to a carbon atom |