US PATENT SUBCLASS 987 / 62
.~.~.~ Ring contains exactly six atoms (9/6544; 9/6547)


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}
61  DF  .~.~ Ring contains N and S only, or may include in addition to the required N and S, only C, O, Se, or Te (9/6536) {2}
62.~.~.~ Ring contains exactly six atoms (9/6544; 9/6547)


DEFINITION

Classification: 987/62

Ring contains exactly six atoms (9/6544; 9/6547):

(under subclass 61) Subject matter wherein the ring containing nitrogen and sulfur atoms is composed of exactly six atoms.