US PATENT SUBCLASS 549 / 43
.~.~.~.~.~ Tricyclo ring system having 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



549 /   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) {2}
1  DF  .~.~ Sulfur containing hetero ring (e.g., thiiranes, etc.) {9}
29  DF  .~.~.~ The hetero ring is five-membered {13}
41  DF  .~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {3}
43.~.~.~.~.~ Tricyclo ring system having the hetero ring as one of the cyclos {1}
44  DF  .~.~.~.~.~.~> Chalcogen attached directly to the tricyclo ring system by nonionic bonding {2}


DEFINITION

Classification: 549/43

(under subclass 41) Compounds wherein the polycyclo ring system consists of exactly three rings.