US PATENT SUBCLASS 987 / 38
.~.~.~ P in ring is directly bonded to at least two O atoms which are in separate rings (9/6571A8; 9/6574A8)

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}
37  DF  .~.~ Ring contains O and P only, or may include in addition to the required O and P, only C (9/6571) {5}
38.~.~.~ P in ring is directly bonded to at least two O atoms which are in separate rings (9/6571A8; 9/6574A8)

DEFINITION

Classification: 987/38

P in ring is directly bonded to at least two O atoms which are in separate rings (9/6571A8; 9/6574A8):

(under subclass 37) Subject matter wherein a phosphorus atom is bonded directly to at least two oxygen atoms and wherein the phosphorus atom is shared by two separate rings and the two oxygen atoms are in different ring systems or are shared by two ring systems.

(1) Note. An example of a compound classified herein is: [figure]