US PATENT SUBCLASS 521 / 163
.~.~.~ With nitrogen 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}
163.~.~.~ With nitrogen containing reactant {1}
164  DF  .~.~.~.~> Nitrogen reactant contains a C-XH group wherein X is a chalcogen atom and wherein the C atom is not double-bonded to a chalcogen atom {3}


DEFINITION

Classification: 521/163

With nitrogen containing reactant:

(under subclass 155) Subject matter wherein a nitrogen containing material is reacted with a -N=C=X containing reactant.