US PATENT SUBCLASS 546 / 251
.~.~.~.~ The pyridine ring is unsubstituted or hydrocarbyl substituted only

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
250  DF  .~.~.~ Process of forming pyridine ring {1}
251.~.~.~.~ The pyridine ring is unsubstituted or hydrocarbyl substituted only {3}
252  DF  .~.~.~.~.~> Starting materials include a nitrogen containing hetero ring (e.g., starting materials include a piperidine ring, etc.)
253  DF  .~.~.~.~.~> Starting materials include a hydrocarbon
254  DF  .~.~.~.~.~> Starting materials include an acyclic hydrocarbyl ether or an acyclic hydrocarbyl alcohol

DEFINITION

Classification: 546/251

The pyridine ring is unsubstituted or hydrocarbyl substituted only:

(under subclass 250) Processes wherein the pyridine ring which is formed is either unsubstituted or substituted by hydrocarbon groups only.

(1) Note. Hydrocarbon groups consist of carbon and hydrogen only. A substituent containing any other atom would not be provided for herein.