US PATENT SUBCLASS 534 / 822
.~.~.~ Plural benzene rings bonded directly to each other and are between the azo groups

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}
816  DF  .~.~ Exactly two azo groups attached indirectly to each other by nonionic bonding {7}
822.~.~.~ Plural benzene rings bonded directly to each other and are between the azo groups {2}
823  DF  .~.~.~.~> Containing -C(=X)-, wherein X is chalcogen (e.g., carbonyl, etc.)
824  DF  .~.~.~.~> Nitrogen, other than as nitro, nitroso or azo, attached indirectly to azo by nonionic bonding {1}

DEFINITION

Classification: 534/822

(under subclass 816) Compounds wherein between the azo groups are at least two benzene rings which are bonded directly to each other.

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