US PATENT SUBCLASS 987 / 350
PHOSPHORUS CONTAINING AT LEAST ONE NITROGEN ATOM AS SOLE HETERO ATOM (9/65)

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

350PHOSPHORUS CONTAINING AT LEAST ONE NITROGEN ATOM AS SOLE HETERO ATOM (9/65) {4}
351  DF  .~> Ring contains at least four nitrogen atoms (9/65D; 9/65D1; 9/65D2; 9/65D3; 9/65D3B)
352  DF  .~> Ring contains three nitrogen atoms (9/65C) {2}
355  DF  .~> Ring contains two N atoms (9/65B) {2}
363  DF  .~> Ring contains a single N atom (9/65A) {5}

DEFINITION

Classification: 987/350

PHOSPHORUS CONTAINING AT LEAST ONE NITROGEN ATOM AS SOLE HETERO ATOM (9/65):

(under the class definition) Subject matter wherein a ring contains only carbon and nitrogen atoms.