US PATENT SUBCLASS 558 / 274
.~.~.~ Two benzene rings bonded directly to the -O-C(=O)O- group (i.e., diaryl carbonates)

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558 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {21}
260  DF  .~ Carbonate esters (i.e, compounds having the -O-C(=O)O- group bonded directly to at least one carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) {8}
270  DF  .~.~ Benzene ring bonded directly to the -O-C(=O)O- group {4}
274.~.~.~ Two benzene rings bonded directly to the -O-C(=O)O- group (i.e., diaryl carbonates)

DEFINITION

Classification: 558/274

(under subclass 270) Compounds wherein the -O-C(=O)O- group is bonded directly to two benzene rings.

(1) Note. Examples of compounds provided for herein are: [figure] [figure]