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} |
142 | DF | .~.~ Cellular product derived from ethylenically unsaturated reactants only {5} |
143 | .~.~.~ From acyclic mono-unsaturated hydrocarbon as only reactant {1} | |
144 | DF | .~.~.~.~> Interpolymer |