US PATENT SUBCLASS 540 / 533
.~.~.~.~.~ The hetero ring is a lactam (i.e., -C(=X)-NH- is part of the ring, wherein X is chalcogen and substitution may be made for the hydrogen only)

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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}
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}
532  DF  .~.~.~.~ Preparing from a compound containing a hetero ring {1}
533.~.~.~.~.~ The hetero ring is a lactam (i.e., -C(=X)-NH- is part of the ring, wherein X is chalcogen and substitution may be made for the hydrogen only)

DEFINITION

Classification: 540/533

(under subclass 532) Processes wherein the hetero ring in the heterocyclic reactant is a lactam; i.e., contains - - NH - as part of the ring, wherein X is chalcogen (i.e., oxygen, selenium or telluriun) and substitution may be made for the hydrogen only.