US PATENT SUBCLASS 552 / 220
.~.~ The polycyclo ring system contains at least four cyclos

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}
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}
220.~.~ The polycyclo ring system contains at least four cyclos

DEFINITION

Classification: 552/220

(under subclass 208) Compounds wherein the anthracene configured ring system is a part of a polycyclo ring system which has at least four cyclos.

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