US PATENT SUBCLASS 552 / 287
.~.~.~ Cyano, carbonyl, nitrogen or sulfur bonded directly to the tetracyclo ring system

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}
271  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 direct at the 9- or 10-position (e.g., anthrones, anthranois, etc.) {10}
286  DF  .~.~ The polycyclo ring system has four cyclos (e.g., benzanthrones, etc.) {2}
287.~.~.~ Cyano, carbonyl, nitrogen or sulfur bonded directly to the tetracyclo ring system

DEFINITION

Classification: 552/287

(under subclass 286) Compounds wherein the tetracyclo ring system has sulfur, nitrogen, carbonyl or cyano bonded directly thereto.

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