US PATENT SUBCLASS 526 / 271
.~.~.~.~ Acid anhydride

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {8}
72  DF  .~ POLYMERS FROM ONLY ETHYLENIC MONOMERS OR PROCESSES OF POLYMERIZING, POLYMERIZABLE COMPOSITIONS CONTAINING ONLY ETHYLENIC MONOMERS AS REACTANTS OR PROCESSES OF PREPARING {43}
266  DF  .~.~ From monomer containing oxygen as part of a heterocyclic ring {5}
270  DF  .~.~.~ 5-membered heterocyclic ring compound contains at least one oxygen atom {1}
271.~.~.~.~ Acid anhydride {1}
272  DF  .~.~.~.~.~> Interpolymerized with hydrocarbon monomer

DEFINITION

Classification: 526/271

(under subclass 270) Subject matter wherein the 5-membered ring contains two carbonyl groups bonded to the same oxygen atom so as to form a hetero ring with the bonded oxygen atom, e.g., [figure] [caption]etc.