US PATENT SUBCLASS 521 / 168
.~.~.~ With phosphorus 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}
168.~.~.~ With phosphorus containing reactant {1}
169  DF  .~.~.~.~> Phosphorus reactant contains a -O-(C-C-O-)-group

DEFINITION

Classification: 521/168

With phosphorus containing reactant:

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