US PATENT SUBCLASS 552 / 505
.~.~ Boron, silicon, selenium or tellurium containing
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}
505
.~.~ Boron, silicon, selenium or tellurium containing
DEFINITION
Classification: 552/505
(under subclass 502) Compounds which contain boron, silicon, selenium or tellurium.