US PATENT SUBCLASS 987 / 364
.~.~ (O=)C-N-C(=O) group where C-N-C is part of the ring (9/65A9)

Current as of: June, 1999
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987 /   HD   ORGANIC COMPOUNDS CONTAINING A Bi, Sb, As, OR P ATOM OR CONTAINING A METAL ATOM OF THE 6TH TO 8TH GROUP OF THE PERIODIC SYSTEM

350  DF  PHOSPHORUS CONTAINING AT LEAST ONE NITROGEN ATOM AS SOLE HETERO ATOM (9/65) {4}
363  DF  .~ Ring contains a single N atom (9/65A) {5}
364.~.~ (O=)C-N-C(=O) group where C-N-C is part of the ring (9/65A9)

DEFINITION

Classification: 987/364

(O=)C-N-C(=O) group where C-N-C is part of the ring (9/65A9):

(under subclass 363) Subject matter wherein the compound contains a (O=)C-N-C(=O) and wherein the C-N-C group are ring atoms.