US PATENT SUBCLASS 987 / 34
.~.~ Ring contains N and P only, or may include in addition to the required N and P, only C, S, or O (9/6581; 9/6584; 9/6584A)

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

30  DF  PHOSPHORUS COMPOUNDS (9/02; 9/06) {15}
33  DF  .~ Compound contains a ring which is devoid of a metal atom and contains at least one P atom as ring member (9/6564; 9/6564V; 9/6568; 9/6568B; 9/6568C; 9/6568D; 9/6568E; 9/6568F) {3}
34.~.~ Ring contains N and P only, or may include in addition to the required N and P, only C, S, or O (9/6581; 9/6584; 9/6584A) {1}
35  DF  .~.~.~> Ring contains at least two P atoms (9/6581D; 9/6587; 9/659; 9/6593)

DEFINITION

Classification: 987/34

Ring contains N and P only, or may include in addition to the required N and P, only C, S, or O (9/6581; 9/6584; 9/6584A):

(under subclass 33) Subject matter wherein a ring contains (a) N and P atoms only or (b) N and P and additional atoms only of C, S, or O.

(1) Note. All of the additional possible atoms need not be present.