US PATENT SUBCLASS 552 / 115
.~.~ Chalcogen bonded directly to one of the rings (e.g., fuchsone, etc.)

Current as of: June, 1999
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552 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
101  DF  .~ Acyclic carbon bonded directly to three benzene rings or to two benzene rings and a cyclohexadienyl ring, which acyclic carbon may not be bonded to a fourth carbon (e.g., triphenylmethane dyestuffs, etc.) {12}
115.~.~ Chalcogen bonded directly to one of the rings (e.g., fuchsone, etc.)

DEFINITION

Classification: 552/115

(under subclass 101) Compounds wherein one of the rings is bonded directly to chalcogen (i.e., oxygen, sulfur, selenium or tellurium).