US PATENT SUBCLASS 540 / 531
.~.~.~.~ Chalcogen or nitrogen attached indirectly to the hetero ring by nonionic bonding

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

Internet Version by PATENTEC © 1999      Terms of Use


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}
484  DF  .~.~ The hetero ring contains seven members including nitrogen and carbon {14}
485  DF  .~.~.~ Chalcogen double bonded directly to a ring carbon adjacent to the ring nitrogen (e.g., caprolactam, etc.) {15}
531.~.~.~.~ Chalcogen or nitrogen attached indirectly to the hetero ring by nonionic bonding

DEFINITION

Classification: 540/531

(under subclass 485) Compounds in which nitrogen or chalcogen (i.e., oxygen, sulfur, selenium or tellurium) is attached indirectly to the hetero ring by nonionic bonding.

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