US PATENT SUBCLASS 521 / 161
.~.~.~ N=C=X reactant contains a heterocyclic ring


Current as of: June, 1999
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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}
155  DF  .~.~ Cellular product derived from a -N=C=X containing reactant wherein X is a chalcogen atom {10}
161.~.~.~ N=C=X reactant contains a heterocyclic ring


DEFINITION

Classification: 521/161

N=C=X reactant contains a heterocyclic ring:

(under subclass 155) Subject matter wherein the -N=C=X reactant contains a heterocyclic ring.

(1) Note. See the Glossary in this class (521) for a definition of the term "heterocyclic" ring.