US PATENT SUBCLASS 508 / 307
.~.~.~ The hetero ring contains at least five ring members (e.g., 1,3-dioxane, furan, etc.)

Current as of: June, 1999
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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}
304  DF  .~.~ Oxygen-containing hetero ring (e.g., allyl glycidyl ether, etc.) {2}
307.~.~.~ The hetero ring contains at least five ring members (e.g., 1,3-dioxane, furan, etc.) {1}
308  DF  .~.~.~.~> Having -C(=O)O- attached directly or indirectly to the hetero ring by nonionic bonding (e.g., sorbitan esters, etc.) {3}

DEFINITION

Classification: 508/307

The hetero ring contains at least five ring members (e.g., 1,3-dioxane, furan, etc.):

(under subclass 304) Compositions wherein five or more ring members are present in the hetero ring.

(1) Note. This subclass provides, inter alia, for components having a hetero ring with more than six members ring oxygen and ring nitrogen, e.g., oxazepines, etc.