US PATENT SUBCLASS 540 / 463
.~.~.~.~ Nitrogen or additional chalcogen attached directly to the hetero ring by nonionic bonding


Current as of: June, 1999
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540 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
450  DF  .~.~ The hetero ring contains at least eight members including nitrogen and carbon {9}
451  DF  .~.~.~ Chalcogen double bonded directly to a ring carbon of the hetero ring which is adjacent to the ring nitrogen (e.g., laurolactam, etc.) {7}
463.~.~.~.~ Nitrogen or additional chalcogen attached directly to the hetero ring by nonionic bonding


DEFINITION

Classification: 540/463

(under subclass 451) Compounds wherein nitrogen or additional chalcogen is attached directly to the hetero ring by nonionic bonding.

(1) Note. An example of a compound provided for herein is: [figure]