US PATENT SUBCLASS 546 / 57
.~.~.~.~.~.~.~.~ Three or more chalcogens containing

Current as of: June, 1999
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546 /   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) {1}
1  DF  .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbons {24}
26  DF  .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {9}
42  DF  .~.~.~.~ Pentacyclo ring system having the six-membered hetero ring as one of the cyclos {3}
47  DF  .~.~.~.~.~ Plural ring hetero atoms in the pentacyclo ring system {2}
49  DF  .~.~.~.~.~.~ Two ring nitrogens in the pentacyclo ring system (e.g., quinacridones, etc.) {2}
56  DF  .~.~.~.~.~.~.~ Three or more ring carbons of the pentacyclo ring system are substituted (e.g., substituted quinacridones, etc.) {1}
57.~.~.~.~.~.~.~.~ Three or more chalcogens containing

DEFINITION

Classification: 546/57

Three or more chalcogens containing:

(under subclass 56) Compounds which contain at least three chalcogens (i.e., oxygen, sulfur, selenium, or tellurium).

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