US PATENT SUBCLASS 548 / 424
.~.~.~.~.~ Two of the cyclos share at least three ring members, or a ring carbon is shared by three of the cyclos (e.g., bridged, peri-fused, etc.)

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}
424.~.~.~.~.~ Two of the cyclos share at least three ring members, or a ring carbon is shared by three of the cyclos (e.g., bridged, peri-fused, etc.) {1}
425  DF  .~.~.~.~.~.~> Benzene ring is cyclo in the tetracyclo ring system

DEFINITION

Classification: 548/424

(under subclass 420) Compounds wherein at least three ring members of one cyclo are ring members of an additional cyclo in the tetracyclo ring system, or wherein one ring carbon is a member of three of the cyclos in the tetracyclo ring system.

(1) Note. Examples of compounds provided for herein are: [figure] [figure]