US PATENT SUBCLASS 528 / 297
.~.~.~ 1,2-epoxy containing reactant

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}
271  DF  .~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10}
272  DF  .~.~ From di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereof {15}
297.~.~.~ 1,2-epoxy containing reactant

DEFINITION

Classification: 528/297

(under subclass 272) Subject matter wherein at least one reactant contains a heterocyclic ring solely composed of two carbon atoms and one oxygen atom as ring members.

(1) Note. The 1, 2-epoxy ring may be part of the carboxylic acid or derivative or may be part of an additional reactant.