US PATENT SUBCLASS 534 / 826
.~.~.~.~.~.~ Plural sulfonic acid groups bonded directly to the same bicyclo ring system (-(0=)S(=0)-OH, wherein H of the -OH may be replaced by the ammonium ion or a Group IA or IIA light metal)

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  DF  .~.~.~ Plural benzene rings bonded directly to each other and are between the azo groups {2}
824  DF  .~.~.~.~ Nitrogen, other than as nitro, nitroso or azo, attached indirectly to azo by nonionic bonding {1}
825  DF  .~.~.~.~.~ Plural nitrogens, other than as nitro, nitroso or azo, attached indirectly to azo by nonionic bonding {1}
826.~.~.~.~.~.~ Plural sulfonic acid groups bonded directly to the same bicyclo ring system (-(0=)S(=0)-OH, wherein H of the -OH may be replaced by the ammonium ion or a Group IA or IIA light metal)

DEFINITION

Classification: 534/826

(under subclass 825) Compounds in which at least two --OH groups are bonded directly to the same bicyclo ring system, wherein H of the -OH may be replaced by the ammonium ion or a Group IA or IIA lighty metal.

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