521 / | HD | SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES |
* | DD | SYNTHETIC RESINS (Class 520, Subclass 1) {3} |
50 | DF | .~ CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC. {27} |
99 | DF | .~.~ Cellular product formation prior to or during solid polymer formation in the presence of a stated ingredient other than water {18} |
123 | DF | .~.~.~ Ingredient contains a metal atom {1} |
124 | DF | .~.~.~.~ Metal atom is part of an organic compound {2} |
125 | .~.~.~.~.~ Organic metal compound contains a Group I or Group II metal atom |