US PATENT SUBCLASS 534 / 612
.~.~.~.~.~ Acyclic -C(=X)-, wherein X is chalcogen, attached directly or indirectly to the hetero ring by nonionic bonding

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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}
603  DF  .~.~ Quaternary ammonium or hydrazinium attached indirectly to an azo group by nonionic bonding {4}
604  DF  .~.~.~ Hetero ring containing {1}
605  DF  .~.~.~.~ The pentavalent nitrogen is a ring member {2}
612.~.~.~.~.~ Acyclic -C(=X)-, wherein X is chalcogen, attached directly or indirectly to the hetero ring by nonionic bonding

DEFINITION

Classification: 534/612

(under subclass 605) Compounds wherein an acyclic -- group, in which X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium) is attached directly or indirectly to the hetero ring by nonionic bonding.

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