US PATENT SUBCLASS 540 / 481
.~.~.~.~ The additional hetero ring is six-membered and contains nitrogen

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

Internet Version by PATENTEC © 1999      Terms of Use


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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
450  DF  .~.~ The hetero ring contains at least eight members including nitrogen and carbon {9}
480  DF  .~.~.~ Additional hetero ring attached directly or indirectly to the hetero ring by nonionic bonding {1}
481.~.~.~.~ The additional hetero ring is six-membered and contains nitrogen

DEFINITION

Classification: 540/481

(under subclass 480) Compounds in which the additional hetero ring is six-membered and contains nitrogen.

(1) Note. An example of a compound provided for herein is: [figure]