US PATENT SUBCLASS 544 / 249
.~.~.~.~.~.~ Tricyclo ring system having the diazine ring as one of the cyclos


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

Internet Version by PATENTEC © 1999      Terms of Use



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

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {1}
1  DF  .~.~ Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6}
224  DF  .~.~.~ The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.) {9}
242  DF  .~.~.~.~ 1,3-diazines {10}
245  DF  .~.~.~.~.~ Polycyclo ring system having the diazine ring as one of the cyclos {3}
249.~.~.~.~.~.~ Tricyclo ring system having the diazine ring as one of the cyclos {2}
250  DF  .~.~.~.~.~.~.~> Three or more ring hetero atoms in the tricyclo ring system {1}
252  DF  .~.~.~.~.~.~.~> Ring nitrogen is shared by two of the cyclos


DEFINITION

Classification: 544/249

Tricyclo ring system having the diazine ring as one of the cyclos:

(under subclass 245) Compounds wherein the polycyclo ring system consists of three rings.