US PATENT SUBCLASS 524 / 112
.~.~.~.~.~.~.~ Cyclic polycarboxylic acid anhydride

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
*  DD  .~ PROCESSES OF PREPARING A DESIRED OR INTENTIONAL COMPOSITION OF AT LEAST ONE NONREACTANT MATERIAL AND AT LEAST ONE SOLID POLYMER OR SPECIFIED INTERMEDIATE CONDENSATION PRODUCT, OR PRODUCT THEREOF (Class 523, subclass 1) {17}
1  DF  .~.~ Adding a NRM to a preformed solid polymer or preformed specified intermediate condensation product, composition thereof; or process of treating or composition thereof {31}
80  DF  .~.~.~ DNRM which is other than silicon dioxide, glass, titanium dioxide, water, halohydrocarbon, hydrocarbon, or elemental carbon {4}
81  DF  .~.~.~.~ Organic DNRM {21}
107  DF  .~.~.~.~.~ At least one chalcogen atom as part of a hetero ring (chalcogen=O, Se, Te) DNRM {5}
111  DF  .~.~.~.~.~.~ Five-membered chalcogen ring {2}
112.~.~.~.~.~.~.~ Cyclic polycarboxylic acid anhydride

DEFINITION

Classification: 524/112

Cyclic polycarboxylic acid anhydride:

(under subclass 111) Subject matter wherein the five-membered hetero ring contains an oxygen hetero atom as part of a cyclic polycarboxylic acid anhydride, e.g., illustrated below, etc.

(1) Note. See the Class 520 Glossary under carboxylic acid or derivative for the definition of an "anhydride".