US PATENT SUBCLASS 552 / 286
.~.~ The polycyclo ring system has four cyclos (e.g., benzanthrones, etc.)

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}
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.~.~ The polycyclo ring system has four cyclos (e.g., benzanthrones, etc.) {2}
287  DF  .~.~.~> Cyano, carbonyl, nitrogen or sulfur bonded directly to the tetracyclo ring system
288  DF  .~.~.~> Halogen or carbon bonded directly to the tetracyclo ring system

DEFINITION

Classification: 552/286

(under subclass 271) Compounds wherein the anthracene configured ring system is part of a ring system composed of four cyclos.

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