US PATENT SUBCLASS 552 / 518
.~.~.~.~ Additional nitrogen bonded directly to the nitrogen (e.g., hydrazones, etc.)

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

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
502  DF  .~ Cyclopentanohydrophenanthrene ring system containing {21}
515  DF  .~.~ Nitrogen bonded directly to the cyclopentanohydrophenanthrene ring system {3}
516  DF  .~.~.~ The nitrogen is double bonded to the cyclopentanohydrophenanthrene ring system {3}
518.~.~.~.~ Additional nitrogen bonded directly to the nitrogen (e.g., hydrazones, etc.)

DEFINITION

Classification: 552/518

(under subclass 516) Compounds wherein an additional nitrogen is bonded directly to the nitrogen.

(1) Note. An example of a compound provided for herein is: [figure]