US PATENT SUBCLASS 526 / 257
.~.~.~ Sulfur-containing ring contains additional hetero atom, i.e., N, O, Se, Te

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526 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {8}
72  DF  .~ POLYMERS FROM ONLY ETHYLENIC MONOMERS OR PROCESSES OF POLYMERIZING, POLYMERIZABLE COMPOSITIONS CONTAINING ONLY ETHYLENIC MONOMERS AS REACTANTS OR PROCESSES OF PREPARING {43}
256  DF  .~.~ From monomer containing sulfur atom as part of a heterocyclic ring {1}
257.~.~.~ Sulfur-containing ring contains additional hetero atom, i.e., N, O, Se, Te

DEFINITION

Classification: 526/257

Sulfur-containing ring contains additional hetero atom, i.e., N, O, Se, Te:

(under subclass 256) Subject matter wherein at least one hetero ring contains as hetero atoms therein at least one sulfur atom and at least one atom of oxygen, nitrogen, selenium, or tellurium.