Ion adsorbent for metals having a coordination number greater than two
Patent 4423158 Issued on December 27, 1983. Estimated Expiration Date: 
January 27, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 27, 2003. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3899472 Process for eliminating metal ions from a metal ion-containing liquid with solid chelate resins Chelate resin prepared by aftertreatment of aminated resin with polyfunctional compound and amine Polymeric polydentate complexons and a method for their preparation Patent #: 4343920 InventorAssigneeApplicationNo. 06/461512 filed on 01/27/1983US Classes:521/32, Treated with nitrogen-containing material521/25, ION-EXCHANGE POLYMER OR PROCESS OF PREPARING521/27, Membrane or process of preparing536/102, Starch or derivative536/112, Dextran or derivative536/56Cellulose or derivativeExaminersPrimary: Schofer, Joseph L.Assistant: Kulkosky, Peter F. Attorney, Agent or FirmInternational ClassesC01G 3/00 (20060101)C01G 11/00 (20060101) C01G 49/00 (20060101) C01G 53/00 (20060101) B01J 45/00 (20060101) AbstractMetal ion adsorbent that is formed by an organic polymer having a hydrophilic character through a content of an average of at least 0.5 substituents per monomer unit of any of the following types: OH, O, CO, NH2, NH or N, so that the concentration of these groups is at least 25 mol-percent. The polymer in a non-aqueous state contains at least 10 μmol of metal binding groups per gram of adsorbent. The metal binding group has 5 coordinating ligand atoms, two of which are nitrogen atoms and three of which are carboxylic acid groups.Other References
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