US PATENT SUBCLASS 552 / 209
.~.~ Phosphorus, selenium, silicon, heavy metal or aluminum containing

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


552 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
208  DF  .~ Polycyclo ring system containing anthracene configured ring system having at least one double bond between ring members and having oxygen single bonded or any atom double bonded directly at the 9- and 10-positions (e.g., anthraquinones, etc.) {19}
209.~.~ Phosphorus, selenium, silicon, heavy metal or aluminum containing

DEFINITION

Classification: 552/209

(under subclass 208) Compounds which contain phosphorus, selenium, silicon, heavy metal or aluminum.

(1) Note. This subclass contains, for example: [figure]