US PATENT SUBCLASS 521 / 25
.~ ION-EXCHANGE POLYMER OR PROCESS OF PREPARING

Current as of: June, 1999
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521 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
25.~ ION-EXCHANGE POLYMER OR PROCESS OF PREPARING {7}
26  DF  .~.~> Process of regenerating
27  DF  .~.~> Membrane or process of preparing
28  DF  .~.~> Previously formed solid ion-exchange polymer admixed with nonreactive material or ion-exchange polymer
29  DF  .~.~> Polymer characterized by defined size or shape other than bead or pearl
30  DF  .~.~> Chemically treated solid polymer {3}
38  DF  .~.~> From ethylenically unsaturated reactant only
39  DF  .~.~> From aldehyde or derivative

DEFINITION

Classification: 521/25

(under subclass 1) Subject matter under Class 520, ... drawn to a solid ion-exchange polymeric material containing ionic groups exchangeable with other ionic groups.

(1) Note. Included in this subclass are ion-exchange solid polymeric materials which are claimed as such or which are disclosed as having a utility as an ion-exchange polymer as well as processes of making such materials. Included in this class are polymeric materials, mixtures, and compositions which can be converted to ion-exchange materials by chemical reactions, processes of making such compositions, as well as mixtures of materials at least one of which is an ion-exchange material or is capable of forming an ion-exchange material and wherein the intent is to form an ion-exchange material. Also, this subclass includes amphoteric solid ion-exchange polymeric materials.

(2) Note. The ionic groups can be acidic and/or basic groups thereby forming cationic, anionic or amphoteric ion-exchange polymeric materials. Typical cationic groups are: Sulfonic acid (-SO3H), carboxylic acid (-COOOH), hydroxyl (-OH), phosphonic (-PO3H2) groups and typical anionic groups are -NH2, =NH, --N groups as well as quaternary groups such as quaternary ammonium, sulfonium, phosphonium, arsonium, antimonium or hydrosulfide groups.

(3) Note. In those subclasses indented herein under wherein only ion-exchange products are claimed and wherein the product claims fail to recite a mode of preparation, such products are to be classified on the basis of the disclosure as to the process of preparing the particular ion-exchange product.

(4) Note. Purification of an ion-exchange polymer (A) to physically or chemically remove impurities therefrom (without chemically modifying the polymer) is classified on the basis of the ion-exchange polymer (B) which is purified.

(5) Note. The line between this subclass and Class 210 as well as the compound and compositions classes is as follows: (A) when a patent contains a claim to an ion-exchange polymer and also a claim to a process involving the mere treatment of a liquid therewith, event though the specific nature of the liquid is claimed, the patent is classified in Class 521 and cross-referenced to the appropriate treating class. If all the claims are drawn to a process of treating liquids with ion-exchange polymers, or any claim includes a significant treatment step, the patent is classified in the appropriate

treating class and cross-referenced to this class (521) when necessary; (B) if a chemical reaction occurs so as to produce a new desirous material, then the patent is classified as an original in the class providing for that particular material, i.e., in the compound classes if a compound and in the composition classes if a new composition, with the proviso that if an organic compound proper for Class 260 is produced then that patent is still classified in this area and is cross-referenced into the appropriate organic compound area.