US PATENT SUBCLASS 987 / 36
.~.~ Ring contains S and P only, or may include in addition to the required S and P, only C or O (9/6578; 9/6578D)

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}
36.~.~ Ring contains S and P only, or may include in addition to the required S and P, only C or O (9/6578; 9/6578D)

DEFINITION

Classification: 987/36

Ring contains S and P only, or may include in addition to the required S and P, only C or O (9/6578; 9/6578D):

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

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