US PATENT SUBCLASS 544 / 52
.~.~.~.~.~.~.~.~ Double bonded divalent chalcogen containing


Current as of: June, 1999
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544 /   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 having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6}
3  DF  .~.~.~ Six-membered hetero ring consists of oxygen, sulfur, nitrogen and carbon (e.g., oxathiazines, etc.) {7}
14  DF  .~.~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {3}
47  DF  .~.~.~.~.~ Bicyclo ring system having the six-membered hetero ring as one of the cyclos {2}
49  DF  .~.~.~.~.~.~ Benzothiazines (including hydrogenated) {2}
51  DF  .~.~.~.~.~.~.~ 1,4-benzothiazines {1}
52.~.~.~.~.~.~.~.~ Double bonded divalent chalcogen containing


DEFINITION

Classification: 544/52

(under subclass 51) Compounds which include a double bonded divalent chalcogen (i.e., oxygen, sulfur, selenium or tellurium).

(1) Note. This subclass is intended to include compounds such as: [figure] [figure]