US PATENT SUBCLASS 564 / 250
.~.~.~ Hydrazones (i.e., HCH=N-HNH, wherein substitution may be made for hydrogen only)

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564 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ AMINO NITROGEN CONTAINING (E.G., UREA, SULFONAMIDES, NITROSAMINES, OXYAMINES, ETC., AND SALTS THEREOF) {37}
248  DF  .~.~ Containing nitrogen double bonded directly to carbon {8}
250.~.~.~ Hydrazones (i.e., HCH=N-HNH, wherein substitution may be made for hydrogen only) {1}
251  DF  .~.~.~.~> Benzene ring containing

DEFINITION

Classification: 564/250

(under subclass 248) Compounds which are hydrazones containing the grouping below. [figure]

(1) Note. This subclass contains, for example: [figure] [figure]