US PATENT SUBCLASS 534 / 806
.~.~ Exactly four azo groups attached indirectly to each other by nonionic bonding

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}
806.~.~ Exactly four azo groups attached indirectly to each other by nonionic bonding {2}
807  DF  .~.~.~> Plural nitrogens bonded directly to the same -C(=X)- group, wherein X is chalcogen (e.g., urea, thiourea, etc.)
808  DF  .~.~.~> Benzidine containing

DEFINITION

Classification: 534/806

(under subclass 573) Compounds in which exactly four azo groups are attached indirectly to each other by nonionic bonding.

(1) Note. An example of a compound provided for herein is: [figure]