US PATENT SUBCLASS 521 / 173
.~.~.~.~.~ With non -C=X containing reactant

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}
170  DF  .~.~.~ With -XH reactant wherein X is a chalcogen atom {3}
172  DF  .~.~.~.~ -XH reactant contains a C=X group, e.g., carboxylic acid ester, etc. {1}
173.~.~.~.~.~ With non -C=X containing reactant

DEFINITION

Classification: 521/173

With non containing reactant:

(under subclass 172) Subject matter wherein in addition to the -N=C=X and containing reactant there is present a third reactant which is devoid of any group.