WO2006005724-A2  LENKA S. ET AL.: "SYNTHETIC RESINS: XV. CHELATION ION EXCHANGE PROPERTIES OF 2,4-DINITROPHENYLHYDRAZONE OF RESACETOPHENONE-FORMALDEHYDE RESIN" POLYMER INTERNATIONAL, vol. 29, no. 2, 1992, pages 103-106, XP008031102;  RATH D.K. ET AL.: "SYNTHETIC RESINS XIV. CHELATION ION EXCHANGE PROPERTIES OF 2,4-DINITRO PHENYLHYDRAZONE OF 2-HYDROXY ACETOPHENONE-FORMALDEHYDE RESIN" JOURNAL OF APPLIED POLYMER SCIENCE, vol. 51, no. 9, 28 February 1994 (1994-02-28), pages 1679-1682, XP000464433 ISSN: 0021-8995EP1784879-B1  LENKA S. ET AL.: "SYNTHETIC RESINS: XV. CHELATION ION EXCHANGE PROPERTIES OF 2,4-DINITROPHENYLHYDRAZONE OF RESACETOPHENONE-FORMALDEHYDE RESIN" POLYMER INTERNATIONAL, vol. 29, no. 2, 1992, pages 103-106, XP008031102;  RATH D.K. ET AL.: "SYNTHETIC RESINS XIV. CHELATION ION EXCHANGE PROPERTIES OF 2,4-DINITRO PHENYLHYDRAZONE OF 2-HYDROXY ACETOPHENONE-FORMALDEHYDE RESIN" JOURNAL OF APPLIED POLYMER SCIENCE, vol. 51, no. 9, 28 February 1994 (1994-02-28), pages 1679-1682, XP000464433 ISSN: 0021-8995WO2006005724-A3  LENKA S. ET AL.: "SYNTHETIC RESINS: XV. CHELATION ION EXCHANGE PROPERTIES OF 2,4-DINITROPHENYLHYDRAZONE OF RESACETOPHENONE-FORMALDEHYDE RESIN" POLYMER INTERNATIONAL, vol. 29, no. 2, 1992, pages 103-106, XP008031102;  RATH D.K. ET AL.: "SYNTHETIC RESINS XIV. CHELATION ION EXCHANGE PROPERTIES OF 2,4-DINITRO PHENYLHYDRAZONE OF 2-HYDROXY ACETOPHENONE-FORMALDEHYDE RESIN" JOURNAL OF APPLIED POLYMER SCIENCE, vol. 51, no. 9, 28 February 1994 (1994-02-28), pages 1679-1682, XP000464433 ISSN: 0021-8995;  LENKA S. ET AL.: "SYNTHETIC RESINS: XV. CHELATION ION EXCHANGE PROPERTIES OF 2,4-DINITROPHENYLHYDRAZONE OF RESACETOPHENONE-FORMALDEHYDE RESIN", POLYMER INTERNATIONAL, vol. 29, no. 2, 1992, pages 103 - 106, XP008031102;  RATH D.K. ET AL.: "SYNTHETIC RESINS XIV. CHELATION ION EXCHANGE PROPERTIES OF 2,4-DINITRO PHENYLHYDRAZONE OF 2-HYDROXY ACETOPHENONE-FORMALDEHYDE RESIN", JOURNAL OF APPLIED POLYMER SCIENCE, vol. 51, no. 9, 28 February 1994 (1994-02-28), pages 1679 - 1682, XP000464433, ISSN: 0021-8995;  LENKA S. ET AL.: "SYNTHETIC RESINS: XV. CHELATION ION EXCHANGE PROPERTIES OF 2,4-DINITROPHENYLHYDRAZONE OF RESACETOPHENONE-FORMALDEHYDE RESIN", POLYMER INTERNATIONAL, vol. 29, no. 2, 1992, pages 103 - 106, XP008031102,relevantClaims[1-32],relevantPassages[&lt;pp&gt;W&lt;/pp&gt;];  RATH D.K. ET AL.: "SYNTHETIC RESINS XIV. CHELATION ION EXCHANGE PROPERTIES OF 2,4-DINITRO PHENYLHYDRAZONE OF 2-HYDROXY ACETOPHENONE-FORMALDEHYDE RESIN", JOURNAL OF APPLIED POLYMER SCIENCE, vol. 51, no. 9, 28 February 1994 (1994-02-28), pages 1679 - 1682, XP000464433, ISSN: 0021-8995,relevantClaims[1-32],relevantPassages[&lt;pp&gt;W&lt;/pp&gt;]