US PATENT SUBCLASS 552 / 506
.~.~ Phosphorus attached directly or indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding

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}
506.~.~ Phosphorus attached directly or indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding {1}
507  DF  .~.~.~> The phosphorus is bonded directly at the 21-position or is bonded directly to a chalcogen which is bonded directly at the 21-positon

DEFINITION

Classification: 552/506

(under subclass 502) Compounds wherein phosphorus is attached directly or indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding.

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