US PATENT SUBCLASS 546 / 266
.~.~.~.~ Chalcogen attached indirectly to pyridine or partially hydrogenated pyridine ring by nonionic bonding


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}
255  DF  .~.~.~ Plural pyridine or partially hydrogenated pyridine rings {6}
266.~.~.~.~ Chalcogen attached indirectly to pyridine or partially hydrogenated pyridine ring by nonionic bonding {1}
267  DF  .~.~.~.~.~> The chalcogen, X, is in a -C(=X)- group


DEFINITION

Classification: 546/266

Chalcogen attached indirectly to pyridine or partially hydrogenated pyridine ring by nonionic bonding:

(under subclass 255) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached indirectly to a pyridine or partially hydrogenated pyridine

ring by nonionic bonding.

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