US PATENT SUBCLASS 540 / 468
.~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos


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}
450  DF  .~.~ The hetero ring contains at least eight members including nitrogen and carbon {9}
467  DF  .~.~.~ The hetero ring contains chalcogen {1}
468.~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos {1}
469  DF  .~.~.~.~.~> Plural nitrogens in the hetero ring


DEFINITION

Classification: 540/468

(under subclass 467) Compounds in which the hetero ring is one of the cyclos of a polycyclo ring system.

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