US PATENT SUBCLASS 508 / 306
.~.~.~.~ And chalcogen double bonded directly to the other ring carbon of the hetero ring which is adjacent to the ring oxygen (e.g., maleic anhydride copolymers, 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}
305  DF  .~.~.~ Chalcogen double bonded directly to a ring carbon of the hetero ring which is adjacent to a ring oxygen (e.g., lactones, etc.) {1}
306.~.~.~.~ And chalcogen double bonded directly to the other ring carbon of the hetero ring which is adjacent to the ring oxygen (e.g., maleic anhydride copolymers, etc.)

DEFINITION

Classification: 508/306

And chalcogen double bonded directly to the other ring carbon of the hetero ring which is adjacent to the ring oxygen (e.g., maleic anhydride copolymers, etc.):

(under subclass 305) Compositions wherein both carbons of the hetero ring that are adjacent to the ring oxygen are double bonded directly to chalcogen (i.e., oxygen, sulfur, selenium, or tellurium).

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