US PATENT SUBCLASS 562 / 70
.~.~.~.~.~ Oxygen bonded directly to the polycyclo ring system (e.g., aminonaphthol sulfonic acid, etc.)


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562 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {41}
30  DF  .~ Sulfonic acids or salts thereof (i.e., compounds containing the sulfonate group, -S(=O)(=O)-O- wherein the single bonded oxygen is bonded directly to hydrogen, or to a group IA or IIA light metal or to substituted or unsubstituted ammonium) {15}
45  DF  .~.~ Benzene ring bonded directly to the sulfonate sulfur (e.g., purification and neutralization of benzene sulfonic acids, etc.) {11}
58  DF  .~.~.~ Nitrogen attached indirectly to the sulfonate group by nonionic bonding {7}
68  DF  .~.~.~.~ Polycyclo ring system consisting of benzene rings bonded directly to the sulfonate group {3}
70.~.~.~.~.~ Oxygen bonded directly to the polycyclo ring system (e.g., aminonaphthol sulfonic acid, etc.) {1}
71  DF  .~.~.~.~.~.~> Additional sulfonate group bonded directly to the polycyclo ring system (e.g., H acid, etc.)


DEFINITION

Classification: 562/70

(under subclass 68) Compounds wherein the polycyclo ring system is bonded directly to oxygen.

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