Patents by Inventor Nebojsa Avdalovic
Nebojsa Avdalovic has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20100307919Abstract: An acid or base is generated in an aqueous solution by the steps of: (a) providing a source of first ions adjacent an aqueous liquid in a first acid or base generation zone, separated by a first barrier (e.g., anion exchange membrane) substantially preventing liquid flow and transporting ions only of the same charge as said first ions, (b) providing a source of second ions of opposite charge adjacent an aqueous liquid in a second acid or base generation zone, separated by a second barrier transporting ions only of the same charge as the second ions, and (c) transporting ions across the first barrier by applying an electrical potential through said first and second zones to generate an acid-containing aqueous solution in one of said first or second zones and a base-containing aqueous solution in the other one which may be combined to form a salt. Also, electrolytic apparatus for performing the above method.Type: ApplicationFiled: June 15, 2010Publication date: December 9, 2010Applicant: Dionex CorporationInventors: Yan Liu, Nebojsa Avdalovic
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Patent number: 7767462Abstract: An acid or base is generated in an aqueous solution by the steps of: (a) providing a source of first ions adjacent an aqueous liquid in a first acid or base generation zone, separated by a first barrier (e.g., anion exchange membrane) substantially preventing liquid flow and transporting ions only of the same charge as said first ions, (b) providing a source of second ions of opposite charge adjacent an aqueous liquid in a second acid or base generation zone, separated by a second barrier transporting ions only of the same charge as the second ions, and (c) transporting ions across the first barrier by applying an electrical potential through said first and second zones to generate an acid-containing aqueous solution in one of said first or second zones and a base-containing aqueous solution in the other one which may be combined to form a salt. Also, electrolytic apparatus for performing the above method.Type: GrantFiled: May 3, 2006Date of Patent: August 3, 2010Assignee: Dionex CorporationInventors: Yan Liu, Nebojsa Avdalovic
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Publication number: 20100144051Abstract: Method and apparatus for generating an acid or base, e.g. for chromatographic analysis of anions. For generating a base the method includes the steps of providing a cation source in a cation source reservoir, flowing an aqueous liquid stream through a base generation chamber separated from the cation source reservoir by a barrier (e.g. a charged membrane) substantially preventing liquid flow while providing a cation transport bridge, applying an electric potential between an anode cation source reservoir and a cathode in the base generation chamber to electrolytically generate hydroxide ions therein and to cause cations in the cation source reservoir to electromigrate and to be transported across the barrier toward the cathode to combine with the transported cations to form cation hydroxide, and removing the cation hydroxide in an aqueous liquid stream as an effluent from the first base generation chamber. Suitable cation sources include a salt solution, a cation hydroxide solution or cation exchange resin.Type: ApplicationFiled: February 17, 2010Publication date: June 10, 2010Applicant: Dionex CorporationInventors: Yan Liu, Hamish Small, Nebojsa Avdalovic
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Patent number: 7704749Abstract: An electrolytic method is provided for purifying an aqueous stream, including at least one contaminant ion. In one embodiment, the eluent stream flows through a purifying flow channel, including ion exchange bed, an electric field is applied through the flowing eluent stream in the purifying flow channel, and the contaminant ion is removed from the eluent stream. In another embodiment, no electric field is applied and the ion exchange bed is periodically regenerated. Two beds may be used with one bed on line while the other bed is regenerated followed by a reversal of flow.Type: GrantFiled: March 5, 2008Date of Patent: April 27, 2010Assignee: Dionex CorporationInventors: Kannan Srinivasan, Nebojsa Avdalovic
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Patent number: 7618535Abstract: Method and apparatus for suppressed ion analysis in which a sample solution of analyte (e.g., anion) in an eluent of electrolyte counterions (e.g., sodium), is chromatographically separated. Then, the counterions are suppressed in a suppression zone and removed and used to convert the analyte ions to salt form in a salt-converting zone. The suppression and salt-converting zones may be contiguous or remote, and may be performed in devices of the membrane suppresser type. Thereafter, the salts or acids or bases formed from them (e.g., in membrane suppressor devices) are detected. Also, salt conversion can be performed using two ion exchange packed bed salt convertors in which one bed is on-line while the other is regenerated, followed by a reversal of flow.Type: GrantFiled: April 27, 2004Date of Patent: November 17, 2009Assignee: Dionex CorporationInventors: Kannan Srinivasan, Sheetal Saini, Nebojsa Avdalovic
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Publication number: 20080203027Abstract: The present invention, provides novel silicon compounds, methods for making these novel silicon compounds, compositions comprising these novel silicon compounds attached to substrates, methods for attaching the novel silicon compounds to substrates and methods for using the compositions in a variety of chromatographic applications.Type: ApplicationFiled: April 28, 2008Publication date: August 28, 2008Applicant: Dionex CorporationInventors: Xiadong Liu, Christopher A. Pohl, Andrei V. Bordunov, Nebojsa Avdalovic
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Publication number: 20080173587Abstract: An electrolytic method is provided for purifying an aqueous stream, including at least one contaminant ion. In one embodiment, the eluent stream flows through a purifying flow channel, including ion exchange bed, an electric field is applied through the flowing eluent stream in the purifying flow channel, and the contaminant ion is removed from the eluent stream. In another embodiment, no electric field is applied and the ion exchange bed is periodically regenerated. Two beds may be used with one bed on line while the other bed is regenerated followed by a reversal of flow.Type: ApplicationFiled: March 5, 2008Publication date: July 24, 2008Applicant: Dionex CorporationInventors: Kannan Srinivasan, Nebojsa Avdalovic
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Patent number: 7402243Abstract: The present invention provides novel silicon compounds, methods for making these novel silicon compounds, compositions comprising these novel silicon compounds attached to substrates, methods for attaching the novel silicon compounds to substrates and methods for using the compositions in a variety of chromatographic applications.Type: GrantFiled: September 10, 2004Date of Patent: July 22, 2008Assignee: Dionex CorporationInventors: Xiadong Liu, Christopher A. Pohl, Andrei V. Bordunov, Nebojsa Avdalovic
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Patent number: 7402283Abstract: An acid or base is generated in an aqueous solution by the steps of: (a) providing a source of first ions adjacent an aqueous liquid in a first acid or base generation zone, separated by a first barrier (e.g., anion exchange membrane) substantially preventing liquid flow and transporting ions only of the same charge as said first ions, (b) providing a source of second ions of opposite charge adjacent an aqueous liquid in a second acid or base generation zone, separated by a second barrier transporting ions only of the same charge as the second ions, and (c) transporting ions across the first barrier by applying an electrical potential through said first and second zones to generate an acid-containing aqueous solution in one of said first or second zones and a base-containing aqueous solution in the other one which may be combined to form a salt. Also, electrolytic apparatus for performing the above method.Type: GrantFiled: September 11, 2002Date of Patent: July 22, 2008Assignee: Dionex CorporationInventors: Yan Liu, Nebojsa Avdalovic
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Patent number: 7390386Abstract: An electrolytic method is provided for purifying an aqueous stream, including at least one contaminant ion. In one embodiment, the eluent stream flows through a purifying flow channel, including ion exchange bed, an electric field is applied through the flowing eluent stream in the purifying flow channel, and the contaminant ion is removed from the eluent stream. In another embodiment, no electric field is applied and the ion exchange bed is periodically regenerated. Two beds may be used with one bed on line while the other bed is regenerated followed by a reversal of flow.Type: GrantFiled: December 2, 2002Date of Patent: June 24, 2008Assignee: Dionez CorporationInventors: Kannan Srinivasan, Nebojsa Avdalovic
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Publication number: 20080116139Abstract: A liquid chromatographic system is provided including catalytically combining hydrogen and oxygen gases in the chromatography eluent stream in a catalytic gas elimination chamber, to form water and thereby reduce the gas content in the eluent stream. Also, a liquid ion chromatographic system in which the effluent from the detector is recycled to a membrane suppressor and then is mixed with a source of eluent for recycle to the chromatographic column.Type: ApplicationFiled: December 12, 2007Publication date: May 22, 2008Applicant: Dionex CorporationInventors: Yan Liu, Christopher A. Pohl, Nebojsa Avdalovic, John M. Riviello, Archava Siriraks
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Patent number: 7329346Abstract: A liquid chromatographic system is provided including catalytically combining hydrogen and oxygen gases in the chromatography eluent stream in a catalytic gas elimination chamber, to form water and thereby reduce the gas content in the eluent stream. Also, a liquid ion chromatographic system in which the effluent from the detector is recycled to a membrane suppressor and then is mixed with a source of eluent for recycle to the chromatographic column.Type: GrantFiled: February 23, 2005Date of Patent: February 12, 2008Assignee: Dionex CorporationInventors: Yan Liu, Christopher A. Pohl, Nebojsa Avdalovic, John M. Riviello, Archava Siriraks
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Patent number: 7303671Abstract: A flow-through ion exchange medium comprising a monolithic stationary phase having interconnecting pores defined by pore walls, and fine ion exchange polymeric layering particles irreversibly bound directly or indirectly to the pore walls, and methods of making such medium and its use on chromatographic separators.Type: GrantFiled: February 11, 2004Date of Patent: December 4, 2007Assignee: Dionex CorporationInventors: Kannan Srinivasan, Philip Zakaria, Nebojsa Avdalovic, Christopher A. Pohl, Paul R. Haddad
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Patent number: 7153476Abstract: Method and apparatus for generating an acid or base, e.g. for chromatographic analysis of anions. For generating a base the method includes the steps of providing a cation source in a cation source reservoir, flowing an aqueous liquid stream through a base generation chamber separated from the cation source reservoir by a barrier (e.g. a charged membrane) substantially preventing liquid flow while providing a cation transport bridge, applying an electric potential between an anode cation source reservoir and a cathode in the base generation chamber to electrolytically generate hydroxide ions therein and to cause cations in the cation source reservoir to electromigrate and to be transported across the barrier toward the cathode to combine with the transported cations to form cation hydroxide, and removing the cation hydroxide in an aqueous liquid stream as an effluent from the first base generation chamber. Suitable cation sources include a salt solution, a cation hydroxide solution or cation exchange resin.Type: GrantFiled: June 21, 2002Date of Patent: December 26, 2006Assignee: Dionex CorporationInventors: Yan Liu, Hamish Small, Nebojsa Avdalovic
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Publication number: 20060211125Abstract: An acid or base is generated in an aqueous solution by the steps of: (a) providing a source of first ions adjacent an aqueous liquid in a first acid or base generation zone, separated by a first barrier (e.g., anion exchange membrane) substantially preventing liquid flow and transporting ions only of the same charge as said first ions, (b) providing a source of second ions of opposite charge adjacent an aqueous liquid in a second acid or base generation zone, separated by a second barrier transporting ions only of the same charge as the second ions, and (c) transporting ions across the first barrier by applying an electrical potential through said first and second zones to generate an acid-containing aqueous solution in one of said first or second zones and a base-containing aqueous solution in the other one which may be combined to form a salt. Also, electrolytic apparatus for performing the above method.Type: ApplicationFiled: May 3, 2006Publication date: September 21, 2006Inventors: Yan Liu, Nebojsa Avdalovic
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Publication number: 20060186046Abstract: A liquid chromatographic system is provided including catalytically combining hydrogen and oxygen gases in the chromatography eluent stream in a catalytic gas elimination chamber, to form water and thereby reduce the gas content in the eluent stream. Also, a liquid ion chromatographic system in which the effluent from the detector is recycled to a membrane suppressor and then is mixed with a source of eluent for recycle to the chromatographic column.Type: ApplicationFiled: February 23, 2005Publication date: August 24, 2006Inventors: Yan Liu, Christopher Pohl, Nebojsa Avdalovic, John Riviello, Archava Siriraks
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Publication number: 20060054559Abstract: The present invention provides novel silicon compounds, methods for making these novel silicon compounds, compositions comprising these novel silicon compounds attached to substrates, methods for attaching the novel silicon compounds to substrates and methods for using the compositions in a variety of chromatographic applications.Type: ApplicationFiled: September 10, 2004Publication date: March 16, 2006Inventors: Xiadong Liu, Christopher Pohl, Andrei Bordunov, Nebojsa Avdalovic
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Publication number: 20060057733Abstract: An apparatus for capillary ion chromatography comprising a suppressor comprising flow-through ion exchange packing in a housing and capillary tubing formed of a permselective ion exchange membrane, and at least partially disposed in said ion exchange packing. Also, a recycle conduit for aqueous liquid from the detector to the packing. Further, the capillary tubing may have weakly acidic or weakly basic functional groups. Also, a method for using the apparatus.Type: ApplicationFiled: September 16, 2004Publication date: March 16, 2006Inventors: Yan Liu, Victor Manuel Berber Barreto, Christopher Pohl, Nebojsa Avdalovic
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Publication number: 20050258048Abstract: Method and apparatus for generating an acid or base, e.g. for chromatographic analysis of anions. For generating a base the method includes the steps of providing a cation source in a cation source reservoir, flowing an aqueous liquid stream through a base generation chamber separated from the cation source reservoir by a barrier (e.g. a charged membrane) substantially preventing liquid flow while providing a cation transport bridge, applying an electric potential between an anode cation source reservoir and a cathode in the base generation chamber to electrolytically generate hydroxide ions therein and to cause cations in the cation source reservoir to electromigrate and to be transported across the barrier toward the cathode to combine with the transported cations to form cation hydroxide, and removing the cation hydroxide in an aqueous liquid stream as an effluent from the first base generation chamber. Suitable cation sources include a salt solution, a cation hydroxide solution or cation exchange resin.Type: ApplicationFiled: July 26, 2005Publication date: November 24, 2005Inventors: Yan Liu, Hamish Small, Nebojsa Avdalovic
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Patent number: 6955922Abstract: Method and apparatus for generating an acid or base, e.g. for chromatographic analysis of anions. For generating a base the method includes the steps of providing a cation source in a cation source reservoir, flowing an aqueous liquid stream through a base generation chamber separated from the cation source reservoir by a barrier (e.g. a charged membrane) substantially preventing liquid flow while providing a cation transport bridge, applying an electric potential between an anode cation source reservoir and a cathode in the base generation chamber to electrolytically generate hydroxide ions therein and to cause cations in the cation source reservoir to electromigrate and to be transported across the barrier toward the cathode to combine with the transported cations to form cation hydroxide, and removing the cation hydroxide in an aqueous liquid stream as an effluent from the first base generation chamber. Suitable cation sources include a salt solution, a cation hydroxide solution or cation exchange resin.Type: GrantFiled: July 7, 2000Date of Patent: October 18, 2005Assignee: Dionex CorporationInventors: Yan Liu, Hamish Small, Nebojsa Avdalovic