US PATENT SUBCLASS 558 / 458
.~.~.~.~ The nitrogen is attached directly to halogen by nonionic bonding, or is part of a nitro, nitroso, nitrate, or N-oxide group

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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}
435  DF  .~.~ Acyclic (e.g., purification of saturated nitriles, etc.) {9}
452  DF  .~.~.~ Nitrogen attached indirectly to the cyano group by nonionic bonding {4}
458.~.~.~.~ The nitrogen is attached directly to halogen by nonionic bonding, or is part of a nitro, nitroso, nitrate, or N-oxide group

DEFINITION

Classification: 558/458

(under subclass 452) Compounds wherein the nitrogen is part of a nitro, nitroso nitrate, or N-oxide group, or is attached directly to halogen by nonionic bonding.

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