US PATENT SUBCLASS 528 / 354
.~.~ From compound having -C-C(=O)-O-C- group as part of a heterocyclic ring, e.g., lactone, etc.

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}
354.~.~ From compound having -C-C(=O)-O-C- group as part of a heterocyclic ring, e.g., lactone, etc. {2}
355  DF  .~.~.~> Polymerizing in the presence of a specified material other than a reactant {2}
359  DF  .~.~.~> Heterocyclic ring compound is a four-membered ring containing one oxygen and three carbon atoms -C-C(=O)-O-C-

DEFINITION

Classification: 528/354

(under subclass 271) Subject matter wherein at least one reactant is a cyclic ester of a carboxylic acid as ring atoms, e.g., as shown below, wherein n is an integer and wherein X is an atom necessary to complete the ring structure and yet maintain the material as an ester. [figure]

SEE OR SEARCH THIS CLASS, SUBCLASS:

271, see the (2) Note.