US PATENT SUBCLASS 534 / 670
.~.~.~ Two 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}
660  DF  .~.~ Hydroxy and carbonyl of -C00- bonded directly to a monocyclic benzene ring (H or hydroxy may be replaced by a substituted or unsubstituted ammonium ion or a metal) {5}
670.~.~.~ Two azo groups attached indirectly to each other by nonionic bonding {1}
671  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: 534/670

(under subclass 660) Compounds in which two azo groups are attached indirectly to each other by nonionic bonding.

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