US PATENT SUBCLASS 528 / 253
.~.~.~ Nonaldehyde or nonaldehyde derivative heterocyclic compound contains two or more heterocyclic rings and includes shared hetero atoms in a fused or bridged ring system

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}
253.~.~.~ Nonaldehyde or nonaldehyde derivative heterocyclic compound contains two or more heterocyclic rings and includes shared hetero atoms in a fused or bridged ring system

DEFINITION

Classification: 528/253

(under subclass 248) Subject matter wherein the reactant which is not an aldehyde or derivative contains two or more heterocyclic rings.

(1) Note. Included herein are those reactant compounds having two distinct heterocyclic ring moieties as well as those reactant compounds wherein a heterocyclic atom is shared between two ring moieties (i.e., fused or bridged rings).