US PATENT SUBCLASS 552 / 276
.~.~ The polycyclo ring system has nine cyclos

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}
276.~.~ The polycyclo ring system has nine cyclos {3}
277  DF  .~.~.~> Cyano, nitrogen or sulfur bonded directly to the nonacyclo ring system {1}
279  DF  .~.~.~> Oxygen single bonded directly to the nonacyclo ring system {1}
281  DF  .~.~.~> Halogen containing

DEFINITION

Classification: 552/276

(under subclass 271) Compounds wherein the anthracene configured ring system is part of a nonacyclo ring system,

i.e., a ring system composed of exactly nine cycles.

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