US PATENT SUBCLASS 548 / 959
.~.~.~ Plural hetero atoms in the hetero ring

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

Internet Version by PATENTEC © 1999      Terms of Use


548 /   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) {4}
954  DF  .~.~ Hetero ring is three-membered including nitrogen and carbon {11}
959.~.~.~ Plural hetero atoms in the hetero ring {1}
960  DF  .~.~.~.~> Plural nitrogens in the hetero ring

DEFINITION

Classification: 548/959

(under subclass 954) Compounds wherein the hereto ring contains two hetero atoms.

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

[figure]