US PATENT SUBCLASS 508 / 288
.~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos (i.e., fused or bridged ring system)

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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}
268  DF  .~.~ The hetero ring contains five members including nitrogen and carbon (e.g., polyvinylpyrrolidone, etc.) {4}
287  DF  .~.~.~ Plural oxygens double bonded directly to ring carbons of the hetero ring which are adjacent to the ring nitrogen {4}
288.~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos (i.e., fused or bridged ring system)

DEFINITION

Classification: 508/288

Polycyclo ring system which contains the hetero ring as one of the cyclos (i.e., fused or bridged ring system):

(under subclass 287) 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]