US PATENT SUBCLASS 549 / 357
.~.~.~.~ Plural ring oxygens in the hetero ring (e.g., 1,2-dioxin, etc.)


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}
356  DF  .~.~.~ The hetero ring is six-membered {9}
357.~.~.~.~ Plural ring oxygens in the hetero ring (e.g., 1,2-dioxin, etc.) {4}
358  DF  .~.~.~.~.~> Polycyclo ring system having the hetero ring as one of the cyclos {2}
367  DF  .~.~.~.~.~> Three or more ring oxygens in the hetero ring {1}
369  DF  .~.~.~.~.~> The ring oxygens are in the 1,3-positions of the hetero ring (e.g., 1,3 dioxane, etc.) {6}
377  DF  .~.~.~.~.~> The ring oxygens are in the 1,4-positions of the hetero ring (e.g., 1,4 dioxane, etc.) {2}


DEFINITION

Classification: 549/357

(under subclass 356) Compounds in which the hetero ring contains at least two ring oxygens.

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