US PATENT SUBCLASS 534 / 789
.~.~.~.~.~ Chalcogen double bonded directly to the hetero ring

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

*  DD  ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) {8}
573  DF  .~ Azo {51}
751  DF  .~.~ Hetero ring containing {5}
753  DF  .~.~.~ Azo bonded directly to the hetero ring or to a polycyclo ring system which contains the hetero ring as one of the cyclos {11}
787  DF  .~.~.~.~ The hetero ring is one of the cyclos in a polycyclo ring system {3}
789.~.~.~.~.~ Chalcogen double bonded directly to the hetero ring

DEFINITION

Classification: 534/789

(under subclass 787) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium or tellurium) is double bonded directly to the hetero ring.