US PATENT SUBCLASS 508 / 251
.~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos (e.g., phenothiazines, 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}
244  DF  .~.~ The hetero ring contains six members including nitrogen and carbon (e.g., pyridine, picoline salts, etc.) {7}
245  DF  .~.~.~ Chalcogen in the hetero ring {2}
251.~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos (e.g., phenothiazines, etc.) {3}
252  DF  .~.~.~.~.~> With compound having saturated or unsaturated triazine, azole, or pyridine ring
253  DF  .~.~.~.~.~> With organic phosphorus compound
254  DF  .~.~.~.~.~> With organic non-heterocyclic nitrogen compound

DEFINITION

Classification: 508/251

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

(under subclass 245) 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 3,7-dibornylphenothiazine.