US PATENT SUBCLASS 987 / 50
.~.~ At least two rings, each ring containing at least one hetero atom, and wherein the rings are condensed directly to each other or condensed together through a common carbocyclic ring system (9/6561)

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}
49  DF  .~ Ring is devoid of a P or a metal atom and contains at least one hereto atom (O, S, N, Se, or Te) and may or may not contain C (9/547; 9/6524) {9}
50.~.~ At least two rings, each ring containing at least one hetero atom, and wherein the rings are condensed directly to each other or condensed together through a common carbocyclic ring system (9/6561) {3}
51  DF  .~.~.~> Six-membered ring containing exactly two N atoms as sole hetero atoms shares two of its adjacent C atoms with a five-membered ring containing exactly two N atoms as sole hetero shares; e.g., purine and analogs, etc. (9/6561E)
52  DF  .~.~.~> Six-membered ring shares a N and C atom with a four-membered ring wherein the six-membered ring contains a C or hetero atom in position 5 and no other hetero atom, the four-membered ring contains the single N as hetero atom; e.g., cephalosporins and analogs, etc. (9/6561B)
53  DF  .~.~.~> Five-membered ring shares a N and C atom with a four-membered ring wherein the six-membered ring contains a C or hetero atom in position 4 and no other hetero atom, the four-membered ring contains the single N as hetero atom; e.g., penicillins and analogs, etc. (9/6561A)

DEFINITION

Classification: 987/50

At least two rings, each ring containing at least one hetero atom, and wherein the rings are condensed directly to each other or condensed together through a common carbocyclic ring system (9/6561):

(under subclass 49) Subject matter wherein the P compound (a) contains two or more ring systems, each of which contains an atom other than C as a ring member, and wherein at least two

of the rings share two or more of their ring atoms together, or (b) where a common carbocyclic ring or ring system shares two or more of its carbon atoms with each of the required rings.