Barrier with a seated ion exchange bead and method

Liquid purification or separation – With means to add treating material – Chromatography

Reexamination Certificate

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C210S656000, C204S194000, C204S647000, C205S512000

Reexamination Certificate



Ion transport apparatus (e.g. an electrolytic eluent generator or a suppressor for ion chromatography) in which ions in a first chamber are transported to a liquid in second chamber through a wall comprising an ion exchange bead sealed in a bead seat. The wall is capable of transport ions but of substantially blocking bulk liquid flow.

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patent: 4500430 (1985-02-01), Dasgupta
patent: 4647380 (1987-03-01), Dasgupta
patent: 4999098 (1991-03-01), Pohl et al.
patent: 5045204 (1991-09-01), Dasgupta et al.
patent: 5352360 (1994-10-01), Stillian et al.
patent: 6225129 (2001-05-01), Liu et al.
patent: 6325976 (2001-12-01), Small et al.
patent: 6682701 (2004-01-01), Liu et al.
patent: 6716629 (2004-04-01), Hess et al.
patent: 2003/0127392 (2003-07-01), Srinivasan et al.
patent: 2003/0132163 (2003-07-01), Srinivasan et al.
patent: 2005/0173346 (2005-08-01), Srinivasan et al.
patent: 2006/0057733 (2006-03-01), Liu et al.
patent: 2006/0211125 (2006-09-01), Liu et al.
patent: WO 2004/024302 (2004-03-01), None
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Kubá{hacek over (n)}, P, PK Dasgupta, CA Pohl. Open tubular anion exchange chromatography. Controlled layered architecture of stationary phase by successive condensation polymerization,Anal. Chem. 79:5462-5467 (2007).
Yang, B, M Takeuchi, PK Dasgupta, T. Umemura, Y Ueki, K Tsunoda. Tailoring elution of tetraalkylammonium ions. Ideal electrostatic selectivity elution order on a polymeric ion exchanger,Anal. Chem. 79:769-772 (2007).
Ueki, Y, T. Umemura, J Li, T Odake, K Tsunoda. Preparation and application of methacrylate-based cation-exchange monolithic columns for capillary ion chromatography,Anal. Chem. 76:7007-7012 (2004).
Yang, B., et al. On-line gas-free electrodialytic eluent generator for capillary ion chromatography.Anal. Chem.80:40-47 (2008).


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