US PATENT SUBCLASS 987 / 357
.~.~.~ N in 1 and 4 positions (9/65B64; 9/65B64E; 9/65B64K; 9/65B4V)

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  DF  .~ Ring contains two N atoms (9/65B) {2}
356  DF  .~.~ Six-membered ring (9/65B6) {3}
357.~.~.~ N in 1 and 4 positions (9/65B64; 9/65B64E; 9/65B64K; 9/65B4V)

DEFINITION

Classification: 987/357

N in 1 and 4 positions (9/65B64; 9/65B64E; 9/65B64K; 9/65B4V):

(under subclass 356) Subject matter wherein the nitrogen atoms in the ring are in 1 and 4 positions.