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.