US PATENT SUBCLASS 544 / 228
.~.~.~.~.~.~ Purine containing (including hydrogenated)

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}
225  DF  .~.~.~.~ Heavy metal or aluminum containing {2}
227  DF  .~.~.~.~.~ Mercury containing {1}
228.~.~.~.~.~.~ Purine containing (including hydrogenated)

DEFINITION

Classification: 544/228

Purine containing (including hydrogenated):

(under subclass 227) Compounds which contain a purine nucleus of the following basic structure in which the bonds between ring members may be single or double bonds. [figure]