US PATENT SUBCLASS 562 / 31
.~.~ Hydrophenanthrene ring system containing

Current as of: June, 1999
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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}
31.~.~ Hydrophenanthrene ring system containing

DEFINITION

Classification: 562/31

(under subclass 30) Compounds which contain the hydrophenanthrene ring system.

(1) Note. The hydrophenanthrene ring system is depicted by the following structure, in which at least one of the rings is not a benzene ring: [figure]