US PATENT SUBCLASS 549 / 245
.~.~.~.~.~.~.~.~ The -C(=X)- is part of a -C(=X)XH group, wherein the X's are the same or diverse chalcogens, or salt thereof (e.g., trimellitic anhydride, etc.)

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549 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {2}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
231  DF  .~.~.~ Cyclic anhydrides (i.e., -C(=X)OC(=X)-, wherein the X's are the same or diverse chalcogens, is part of the hetero ring) {2}
233  DF  .~.~.~.~ The cyclic anhydride is five-membered (e.g., succinic anhydride, etc.) {7}
234  DF  .~.~.~.~.~ Polycyclo ring system having the cyclic anhydride as one of the cyclos {3}
240  DF  .~.~.~.~.~.~ Bicyclo ring system having the cyclic anhydride as one of the cyclos {5}
244  DF  .~.~.~.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the bicyclo ring system {1}
245.~.~.~.~.~.~.~.~ The -C(=X)- is part of a -C(=X)XH group, wherein the X's are the same or diverse chalcogens, or salt thereof (e.g., trimellitic anhydride, etc.)

DEFINITION

Classification: 549/245

(under subclass 244) Compounds in which the -- is part of a --XH group, wherein the X's are the same or diverse chalcogens (i.e., oxygen, sulfur, selenium or tellurium); and wherein H of -XH may be replaced by a substituted or unsubstituted ammonium ion or a Group IA or IIA light metal.

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