US PATENT SUBCLASS 562 / 491
.~.~.~ Plural rings bonded directly to the same carbon

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}
400  DF  .~ Carboxylic acids and salts thereof {14}
405  DF  .~.~ Aromatic {13}
491.~.~.~ Plural rings bonded directly to the same carbon

DEFINITION

Classification: 562/491

Plural rings bonded directly to the same carbon:

(under subclass 405) Compounds wherein the acid contains two carbocyclic nuclei bonded to one methylene group and has only one carboxyl group.

(1) Note. This subclass contains, for example: [figure] [figure]