US PATENT SUBCLASS 558 / 289
.~.~.~.~ Nitrogen in the ring

Current as of: June, 1999
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558 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {21}
286  DF  .~ Borate esters (i.e., compounds having boron and carbon each single bonded to the same oxygen, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) {4}
287  DF  .~.~ Boron and oxygen in the same ring {1}
288  DF  .~.~.~ Carbon in the ring {3}
289.~.~.~.~ Nitrogen in the ring

DEFINITION

Classification: 558/289

(under subclass 288) Compounds which contain a ring having nitrogen, carbon, boron and oxygen as ring members.

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