US PATENT SUBCLASS 987 / 188
.~.~ P(=N) group containing (9/06B; 9/06B2; 9/06B2D)

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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

30  DF  PHOSPHORUS COMPOUNDS (9/02; 9/06) {15}
187  DF  .~ Phosphorus directly bonded to N, i.e., P(N) (9/22; 9/22A) {7}
188.~.~ P(=N) group containing (9/06B; 9/06B2; 9/06B2D)

DEFINITION

Classification: 987/188

P(=N) group containing (9/06B; 9/06B2; 9/06B2D):

(under subclass 187) Subject matter wherein the phosphorus atom is directly bonded to at least one nitrogen atom by a double bond, i.e., P=N.