US PATENT SUBCLASS 424 / 78.1
.~ Ion exchange resin

Current as of: June, 1999
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424 /   HD   DRUG, BIO-AFFECTING AND BODY TREATING COMPOSITIONS

78.08  DF  SOLID SYNTHETIC ORGANIC POLYMER AS DESIGNATED ORGANIC ACTIVE INGREDIENT (DOAI) {6}
78.1.~ Ion exchange resin {2}
78.11  DF  .~.~> Plural ion exchange resins
78.12  DF  .~.~> Adsorbate or treating agent contains nitrogen {3}

DEFINITION

Classification: 424/78.1

Ion exchange resin:

(under subclass 78.08) Subject matter wherein the solid synthetic polymer is an ion-exchange resin; e.g., sodium acrylate-divinyl benzene copolymer, sodium salts of sulfonated polystyrene and sulfonated polystyrene-divinyl benzene, quaternized product of chloromethylated polystyrene-divinyl benzene, etc.

(1) Note. Since many polymers possess ionic structures as exemplified above, classification is proper here only when the ion exchange properties are clearly disclosed or claimed; e.g., a patent claims the use of an ion exchange resin used to treat hypercholesteremia (i.e., reduction of serum cholesterol), etc.

(2) Note. Ion exchange resins are those synthetic resins containing active groups (usually sulfonic, carboxylic, phenol, or substituted amino groups) that give the resin the property of combining with or exchanging ions between the resin and a solution. Thus, a resin with active sulfonic groups can be converted to the sodium form and will then exchange its sodium ions with the calcium ions present in hard water. "Amberlite" resins are of this type.

SEE OR SEARCH CLASS

514, Drug, Bio-Affecting and Body Treating Compositions, appropriate subclasses for ion exchange resins which are not considered designated organic active ingredients.

521, Synthetic Resins or Natural Rubbers,

25+, for ion exchange resins and processes of preparing.