US PATENT SUBCLASS 534 / 591
.~.~.~ Formation of -C(=X)HNH group, wherein X is chalcogen (substitution may be made for hydrogen only)

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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}
588  DF  .~.~ Process utilizing azo compound as reactant {13}
591.~.~.~ Formation of -C(=X)HNH group, wherein X is chalcogen (substitution may be made for hydrogen only)

DEFINITION

Classification: 534/591

(under subclass 588) Processes whereby a [Fig. 1] group is formed, wherein X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium). [figure] [caption]FIGURE 1