US PATENT SUBCLASS 534 / 652
.~.~ Formazan containing (i.e., HNH-N=CH-N=NH, wherein 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}
652.~.~ Formazan containing (i.e., HNH-N=CH-N=NH, wherein substitution may be made for hydrogen only)

DEFINITION

Classification: 534/652

(under subclass 573) Compounds which contain the formazan group, i.e., -N=-N=N-.

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