US PATENT SUBCLASS 540 / 355
.~.~.~.~ The additional chalcogen is bonded directly to the ring 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}
200  DF  .~.~ Hetero ring is four-membered containing nitrogen and having chalcogen double bonded directly to a ring carbon which is adjacent to the ring nitrogen {7}
354  DF  .~.~.~ Additional chalcogen bonded directly to the hetero ring {5}
355.~.~.~.~ The additional chalcogen is bonded directly to the ring nitrogen

DEFINITION

Classification: 540/355

(under subclass 354) Compounds wherein the additional chalcogen is bonded directly to the ring nitrogen.

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