US PATENT SUBCLASS 534 / 677
.~.~.~ Plural azo groups in the same azo moiety 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}
676  DF  .~.~ Plural -HNH groups or -OH and -HNH bonded directly to a monocyclic benzene ring (H of -OH may be replaced by a substituted or unsubstituted ammonium ion or metal) {2}
677.~.~.~ Plural azo groups in the same azo moiety attached indirectly to each other by nonionic bonding {1}
678  DF  .~.~.~.~> Sulfonic acid group containing (-(0=)S(=0)-OH, wherein H of -OH may be replaced by a substituted or unsubstituted ammonium ion or metal) {2}

DEFINITION

Classification: 534/677

(under subclass 676) Compounds in which at least two azo

groups within the same azo moiety are attached indirectly to each other by nonionic bonding.

(1) Note. The term "azo moiety" as used herein is intended to include singularly each of the azo compounds which complex with a heavy metal in the formation of a sandwich-type compound.

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