US PATENT SUBCLASS 521 / 166
.~.~.~.~.~ Nitrogen reactant contains a nitrogen containing heterocyclic ring

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
163  DF  .~.~.~ With nitrogen containing reactant {1}
164  DF  .~.~.~.~ Nitrogen reactant contains a C-XH group wherein X is a chalcogen atom and wherein the C atom is not double-bonded to a chalcogen atom {3}
166.~.~.~.~.~ Nitrogen reactant contains a nitrogen containing heterocyclic ring

DEFINITION

Classification: 521/166

Nitrogen reactant contains a nitrogen containing heterocyclic ring:

(under subclass 164) Subject matter wherein a heterocyclic compound containing a nitrogen atom as a ring atom is employed as a reactant.

SEE OR SEARCH CLASS

520, Synthetic Resins and Rubbers, Glossary, for a definition of the term "heterocyclic".