US PATENT SUBCLASS 528 / 248
.~.~ With heterocyclic reactant which is not an aldehyde or derivative

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.~.~ With heterocyclic reactant which is not an aldehyde or derivative {5}
249  DF  .~.~.~> Nonaldehyde or nonaldehyde derivative heterocyclic compound contains an oxygen atom as a ring member of the heterocyclic compound {1}
251  DF  .~.~.~> Nonaldehyde or nonaldehyde derivative heterocyclic compound contains a sulfur atom as a ring member of the heterocyclic compound
252  DF  .~.~.~> Nonaldehyde or nonaldehyde derivative heterocyclic compound contains only two nitrogen atoms as ring members of the heterocyclic compound
253  DF  .~.~.~> Nonaldehyde or nonaldehyde derivative heterocyclic compound contains two or more heterocyclic rings and includes shared hetero atoms in a fused or bridged ring system
254  DF  .~.~.~> Nonaldehyde or nonaldehyde derivative heterocyclic reactant contains a six membered ring having three nitrogen and three carbon atoms as ring members {4}

DEFINITION

Classification: 528/248

(under subclass 230) Subject matter wherein an aldehyde or derivative is reacted with at least one heterocyclic reactant, which reactant is a nonaldehyde or nonaldehyde derivative.

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, see the Glossary for a definition of the term "heterocyclic".