US PATENT SUBCLASS 987 / 56
.~.~ Ring contains S only, or may include in addition to the required S, only C, Se, or Te (9/6553)

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}
56.~.~ Ring contains S only, or may include in addition to the required S, only C, Se, or Te (9/6553) {1}
57  DF  .~.~.~> Ring is condensed or bridged to a carbocyclic ring system (9/6553V)

DEFINITION

Classification: 987/56

Ring contains S only, or may include in addition to the required S, only C, Se, or Te (9/6553):

(under subclass 49) Subject matter wherein the phosphorus compound (a) contains at least one ring having only sulfur, per se, as a ring member or (b) contains a ring having at least one atom of sulfur and additional ring atoms of only carbon, selenium, or tellurium.