US PATENT SUBCLASS 987 / 31
.~ Compound contains a ring which is devoid of a metal atom as ring member and wherein the ring contains at least one atom other than C, N, O, S, P, Se, or Te as a ring atom; e.g., boron, etc. (9/6596)


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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}
31.~ Compound contains a ring which is devoid of a metal atom as ring member and wherein the ring contains at least one atom other than C, N, O, S, P, Se, or Te as a ring atom; e.g., boron, etc. (9/6596)


DEFINITION

Classification: 987/31

Compound contains a ring which is devoid of a metal atom as ring member and wherein the ring contains at least one atom other than C, N, O, S, P, Se, or Te as a ring atom; e.g.,

boron, etc. (9/6596):

(under subclass 30) Subject matter wherein a ring contains at least one atom other than C, N, O, S, P, Se, or Te as ring members.