US PATENT SUBCLASS 552 / 509
.~.~ Plural cyclopentanohydrophenanthrene ring systems
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}
509
.~.~ Plural cyclopentanohydrophenanthrene ring systems
DEFINITION
Classification: 552/509
(under subclass 502) Compounds which contain at least two cyclopentanohydrophenanthrene ring systems.
(1) Note. An example of a compound provided for herein is: [figure]