US PATENT SUBCLASS 528 / 355
.~.~.~ Polymerizing in the presence of a specified material other than a 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}
354  DF  .~.~ From compound having -C-C(=O)-O-C- group as part of a heterocyclic ring, e.g., lactone, etc. {2}
355.~.~.~ Polymerizing in the presence of a specified material other than a reactant {2}
356  DF  .~.~.~.~> Material contains a phosphorus or sulfur atom
357  DF  .~.~.~.~> Material contains a metal atom {1}

DEFINITION

Classification: 528/355

(under subclass 354) Subject matter wherein the cyclic ester is polymerized in the presence of a specified material.

SEE OR SEARCH CLASS

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