US PATENT SUBCLASS 508 / 301
.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos (e.g., benzothiophenes, etc.)

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508 /   HD   SOLID ANTI-FRICTION DEVICES, MATERIALS THEREFOR, LUBRICANT OR SEPARATE COMPOSITIONS FOR MOVING SOLID SURFACES, AND MISCELLANEOUS MINERAL OIL COMPOSITIONS

110  DF  LUBRICANTS OR SEPARANTS FOR MOVING SOLID SURFACES AND MISCELLANEOUS MINERAL OIL COMPOSITIONS (E.G., WATER CONTAINING, ETC.) {53}
243  DF  .~ Heterocyclic ring compound; a heterocyclic ring is one having as ring members only carbon and at least one hetero atom selected from nitrogen and chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) {4}
299  DF  .~.~ Sulfur-containing hetero ring {3}
301.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos (e.g., benzothiophenes, etc.)

DEFINITION

Classification: 508/301

Polycyclo ring system which contains the hetero ring as one of the cyclos (e.g., benzothiophenes, etc.):

(under subclass 299) Compositions wherein the hetero ring is one of the cyclos of a polycyclo ring system.

(1) Note. Fused and bridged ring systems are considered to be polycyclo ring systems. Two rings joined solely by a spiro linkage are not considered to form a polycyclo ring system.

(2) Note. An example of a component provided for herein is [figure]