US PATENT SUBCLASS 558 / 421
.~.~.~.~.~ Plural cyano groups bonded directly to a benzene ring, which is further unsubstituted or hydrocarbyl substituted only

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {21}
303  DF  .~ Nitriles (i.e., compounds having cyano bonded directly to carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) {21}
411  DF  .~.~ Benzene ring bonded directly to the cyano group {6}
418  DF  .~.~.~ Nitrogen, except as nitro or nitroso, attached indirectly to the cyano group by nonionic bonding {2}
419  DF  .~.~.~.~ Plural cyano groups containing {2}
421.~.~.~.~.~ Plural cyano groups bonded directly to a benzene ring, which is further unsubstituted or hydrocarbyl substituted only

DEFINITION

Classification: 558/421

(under subclass 419) Compounds wherein plural cyano groups are bonded directly to a benzene ring, which is further unsubstituted or hydrocarbyl substituted only.

(1) Note. Examples of compounds provided for herein are: [figure] [figure] [figure]