US PATENT SUBCLASS 528 / 73
.~.~ Reactant contains at least one heterocyclic ring

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}
44  DF  .~ FROM REACTANT HAVING AT LEAST ONE -N=C=X GROUP (WHEREIN X IS A CHALCOGEN ATOM) AS WELL AS PRECURSORS THEREOF, E.G., BLOCKED ISOCYANATE, ETC. {17}
73.~.~ Reactant contains at least one heterocyclic ring

DEFINITION

Classification: 528/73

(under subclass 44) Subject matter wherein at least one reactant contains a heterocyclic ring.

(1) Note. Reactants are classified herein only if a positive recitation is noted that a reactant contains a heterocyclic group (e.g., reactants prepared from a heterocyclic material wherein the heterocyclic group has been destroyed would be classified elsewhere it is unambiguous from the specification of the patent that some heterocyclic group still exists in the reactant.

(2) Note. Included herein but not limited to the following examples are oxirane, aziridine, triazine, cyclic anhydrides, etc.

SEE OR SEARCH CLASS

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