US PATENT SUBCLASS 522 / 169
.~.~.~ Two or more hetero atoms in hetero ring at least one of which is oxygen

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
1  DF  .~ COMPOSITIONS TO BE POLYMERIZED BY WAVE ENERGY WHEREIN SAID COMPOSITION CONTAINS A RATE-AFFECTING MATERIAL; OR COMPOSITIONS TO BE MODIFIED BY WAVE ENERGY WHEREIN SAID COMPOSITION CONTAINS A RATE-AFFECTING MATERIAL; OR PROCESSES OF PREPARING OR TREATING A SOLID POLYMER UTILIZING WAVE ENERGY {27}
168  DF  .~.~ Processes of preparing a solid polymer from a heterocyclic chalogen monomer; or compsitions therefore {2}
169.~.~.~ Two or more hetero atoms in hetero ring at least one of which is oxygen

DEFINITION

Classification: 522/169

Two or more hetero atoms in hetero ring at least one of which is oxygen:

(under subclass 168) Subject matter wherein the heterocyclic reactant contains at least two hetero atoms in the same hetero ring and wherein at least one of said hetero atoms is oxygen.