US PATENT SUBCLASS 558 / 271
.~.~.~ Additional chalcogen bonded directly to the benzene ring

Current as of: June, 1999
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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}
271.~.~.~ Additional chalcogen bonded directly to the benzene ring

DEFINITION

Classification: 558/271

(under subclass 270) Compounds wherein the benzene ring is bonded directly to an additional chalcogen (i.e., oxygen, sulfur, selenium, or tellurium).

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