US PATENT SUBCLASS 549 / 297
.~.~.~.~.~ Polycyclo ring system having the lactone 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}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
263  DF  .~.~.~ Lactones (i.e., -C(=X)O-, wherein X is chalcogen, is part of the hetero ring) {6}
295  DF  .~.~.~.~ The lactone ring is five-membered {10}
297.~.~.~.~.~ Polycyclo ring system having the lactone ring as one of the cyclos {3}
298  DF  .~.~.~.~.~.~> Tetracyclo ring system having the lactone ring as one of the cyclos
299  DF  .~.~.~.~.~.~> Tricyclo ring system having the lactone ring as one of the cyclos {2}
302  DF  .~.~.~.~.~.~> Bicyclo ring system having the lactone ring as one of the cyclos {6}


DEFINITION

Classification: 549/297

(under subclass 295) Compounds wherein the five-membered lactone is one of the cyclos of a polycyclo ring system.

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

[figure]