US PATENT SUBCLASS 987 / 189
.~.~ (Hal)-P-(N) group containing (9/26)

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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}
189.~.~ (Hal)-P-(N) group containing (9/26)

DEFINITION

Classification: 987/189

(Hal)-P-(N) group containing (9/26):

(under subclass 187) Subject matter wherein the phosphorus atom directly bonded to at least one nitrogen atom is also directly bonded to at least one halogen atom, i.e., Hal-P=N.