US PATENT SUBCLASS 987 / 61
.~.~ 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)

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.~.~ 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  DF  .~.~.~> Ring contains exactly six atoms (9/6544; 9/6547)
63  DF  .~.~.~> Ring contains exactly five atoms (9/6539) {1}

DEFINITION

Classification: 987/61

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):

(under subclass 49) Subject matter wherein the ring contains (a) only atoms of sulfur and nitrogen or (b) only atoms of sulfur, nitrogen, and carbon or (c) oxygen, selenium, or tellurium as the sole additional atoms in a ring of (a) or (b) above.