US PATENT SUBCLASS 987 / 355
.~ Ring contains two N atoms (9/65B)

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}
355.~ Ring contains two N atoms (9/65B) {2}
356  DF  .~.~> Six-membered ring (9/65B6) {3}
360  DF  .~.~> Five-membered ring (9/65B5) {2}

DEFINITION

Classification: 987/355

Ring contains two nitrogen atoms (9/65B):

(under subclass 350) Subject matter wherein the ring contains two nitrogen atoms.