US PATENT SUBCLASS 521 / 157
.~.~.~ With a C-C(=X)-XH or C-C(=X)-X-C(=X)-C- reactant wherein X is a chalcogen atom, e.g., carboxylic acid or anhydride, 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}
155  DF  .~.~ Cellular product derived from a -N=C=X containing reactant wherein X is a chalcogen atom {10}
157.~.~.~ With a C-C(=X)-XH or C-C(=X)-X-C(=X)-C- reactant wherein X is a chalcogen atom, e.g., carboxylic acid or anhydride, etc.

DEFINITION

Classification: 521/157

With a C XH or C X C, reactant wherein X is a chalcogen atom:

(under subclass 155) Subject matter wherein a compound

containing a C XH or C X C, (X is a chalcogen) group is reacted with a -N=C=X containing material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

172+, for a cellular product which is the result of the reaction between -N=C=X containing compound and a carboxylic acid ester reactant.