US PATENT SUBCLASS 548 / 426
.~.~.~.~.~ The five-membered hetero ring shares ring members with one other cyclo only

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}
400  DF  .~.~ Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) {20}
416  DF  .~.~.~ Polycyclo ring system having the five-membered hetero ring as one of the cyclos {5}
420  DF  .~.~.~.~ Tetracyclo ring system having the five-membered hetero ring as one of the cyclos {3}
426.~.~.~.~.~ The five-membered hetero ring shares ring members with one other cyclo only

DEFINITION

Classification: 548/426

(under subclass 420) Compounds wherein ring members of the five-membered hetero ring are ring members of one additional cyclo only in the tetracyclo ring system.

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