US PATENT SUBCLASS 528 / 257-- .~.~.~.~ With reactant containing at least one noncyclic carbon atom bonded to at least three atoms of nitrogen, e.g., dicyanodiamide, etc.

US PATENT SUBCLASS 528 / 257
.~.~.~.~ With reactant containing at least one noncyclic carbon atom bonded to at least three atoms of nitrogen, e.g., dicyanodiamide, etc.

Current as of: June, 1999
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528 /	HD	SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*	DD	SYNTHETIC RESINS (Class 520, Subclass 1) {23}
230	DF	.~ FROM ALDEHYDE OR DERIVATIVE THEREOF AS REACTANT {12}
248	DF	.~.~ With heterocyclic reactant which is not an aldehyde or derivative {5}
254	DF	.~.~.~ Nonaldehyde or nonaldehyde derivative heterocyclic reactant contains a six membered ring having three nitrogen and three carbon atoms as ring members {4}
257		.~.~.~.~ With reactant containing at least one noncyclic carbon atom bonded to at least three atoms of nitrogen, e.g., dicyanodiamide, etc.

DEFINITION

Classification: 528/257

(under subclass 254) Subject matter wherein a reactant containing an extracyclic carbon atom bonded to at least three nitrogen atoms is utilized in preparing a polymer and wherein the reactant, as illustrated below, is not (1) an aldehyde or aldehyde derivative, or (2) a compound having a six-membered heterocyclic ring containing three nitrogen and three carbon atoms as ring members. [figure]

(1) Note. Extracyclic carbon as used in this subclass denotes a carbon atom which is not a ring atom of a ring-containing compound.