US PATENT SUBCLASS 521 / 188
.~.~.~.~ Nitrogen reactant contains a -N-C(=X)-N group wherein X is a chalcogen atom, e.g.,urea, etc.

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}
186  DF  .~.~ Cellular product derived from reactant which is an aldehyde or aldehyde derivative {1}
187  DF  .~.~.~ Nitrogen containing reactant {1}
188.~.~.~.~ Nitrogen reactant contains a -N-C(=X)-N group wherein X is a chalcogen atom, e.g.,urea, etc.

DEFINITION

Classification: 521/188

Nitrogen reactant contains a -NN group wherein X is a chalcogen atom:

(under subclass 187) Subject matter wherein the nitrogen reactant contains a -N N moiety wherein X is a chalcogen atom.