US PATENT SUBCLASS 546 / 257
.~.~.~.~ Pyridine or partially hydrogenated pyridine rings are bonded directly to each other

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}
257.~.~.~.~ Pyridine or partially hydrogenated pyridine rings are bonded directly to each other {2}
258  DF  .~.~.~.~.~> Halogen containing or process utilizing halogen or halogen containing compound {1}
260  DF  .~.~.~.~.~> Metal containing catalyst utilized

DEFINITION

Classification: 546/257

Pyridine or partially hydrogenated pyridine rings are bonded directly to each other:

(under subclass 255) Compounds wherein the pyridine or partially hydrogenated pyridine rings are bonded directly to each other.

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