US PATENT SUBCLASS 540 / 489
.~.~.~.~.~ Plural nitrogens 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


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}
484  DF  .~.~ The hetero ring contains seven members including nitrogen and carbon {14}
485  DF  .~.~.~ Chalcogen double bonded directly to a ring carbon adjacent to the ring nitrogen (e.g., caprolactam, etc.) {15}
488  DF  .~.~.~.~ Chalcogen in the hetero ring {2}
489.~.~.~.~.~ Plural nitrogens in the hetero ring

DEFINITION

Classification: 540/489

(under subclass 488) Compounds in which the hetero ring contains at least two nitrogens.

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