US PATENT SUBCLASS 552 / 512
.~.~.~ The additional ring shares the 5,10- or 5,19-positions of the cyclopentanohydrophenanthrene ring system

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}
510  DF  .~.~ The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos {4}
512.~.~.~ The additional ring shares the 5,10- or 5,19-positions of the cyclopentanohydrophenanthrene ring system

DEFINITION

Classification: 552/512

(under subclass 510) Compounds in which the additional ring shares the 5,10- or 5,19-positions of the cyclopentanohydrophenanthrene ring system.

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