Patents by Inventor Sheetal Bhardwaj
Sheetal Bhardwaj 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: 20140332387Abstract: A sandwich suppressor in an ion chromatography system in which loosely packed ion exchange resin of low density is disposed in the central sample stream flow channel. Also, a method of using the suppressor is described.Type: ApplicationFiled: May 8, 2013Publication date: November 13, 2014Inventors: Kannan SRINIVASAN, Christopher A. POHL, Sheetal BHARDWAJ, Rong LIN
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Patent number: 8802011Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.Type: GrantFiled: May 30, 2013Date of Patent: August 12, 2014Assignee: Dionex CorporationInventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
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Patent number: 8802010Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.Type: GrantFiled: May 30, 2013Date of Patent: August 12, 2014Assignee: Dionex CorporationInventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
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Publication number: 20140134050Abstract: An apparatus for detecting analytes in a liquid sample may include an elongated primary channel through which an ionic species flows, the primary channel extending through a primary channel member, a first regenerant channel through which a regenerant flows, the first regenerant channel extending adjacent to the primary channel and being formed in a first block, a first charged barrier having exchangeable ions capable of passing ions of only one charge, positive or negative, and of blocking bulk liquid flow, the first charged barrier disposed between the primary channel member and the first block for separating the primary channel from the first regenerant channel, and a first sealing member disposed between the first charged barrier and the first block defining the first regenerant channel.Type: ApplicationFiled: November 12, 2012Publication date: May 15, 2014Inventors: Kannan SRINIVASAN, Glenn M. KUSE, Rong LIN, Sheetal BHARDWAJ
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Publication number: 20130256232Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.Type: ApplicationFiled: May 30, 2013Publication date: October 3, 2013Inventors: Yan LIU, Kannan SRINIVASAN, Christopher A. POHL, Sheetal BHARDWAJ, Zhongqing LU
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Publication number: 20130259750Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.Type: ApplicationFiled: May 30, 2013Publication date: October 3, 2013Inventors: Yan LIU, Kannan SRINIVASAN, Christopher A. POHL, Sheetal BHARDWAJ, Zhongqing LU
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Patent number: 8465982Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.Type: GrantFiled: March 29, 2011Date of Patent: June 18, 2013Assignee: Dionex CorporationInventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
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Publication number: 20120231195Abstract: The present invention provides a new design for high capacity stationary phases for dianion selective ion chromatography. The stationary phases include one or more layers which are products of condensation polymerization. Multiple components are of use in forming the first polymer layer and the condensation polymer structure, thereby providing a stationary phase that can be engineered to have a desired property such as ion capacity, ion selectivity, and the like. Exemplary condensation polymers are formed by the reaction of at least one polyfunctional compound with at least one compound of complimentary reactivity, e.g., a nucleophilic polyfunctional compound reacting with an electrophilic compound.Type: ApplicationFiled: March 9, 2012Publication date: September 13, 2012Applicant: Dionex CorporationInventors: Christopher A. Pohl, Kannan Srinivasan, Sheetal Bhardwaj
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Publication number: 20110210055Abstract: The present invention provides a new design for high capacity stationary phases for chromatography, for example, ion chromatography. The stationary phases include a first polymer layer in contact with and at least partially coating the substrate of the stationary phase. The first polymer layer serves as a foundation for the attachment, and in various embodiments, the growth and attachment, of a highly hyperbranched polymer structure, typically based on one or more products of condensation polymerization. Multiple components are of use in forming the first polymer layer and the hyperbranched polymer structure, thereby providing a stationary phase that can be engineered to have a desired property such as ion capacity, ion selectivity, and the like. Exemplary condensation polymers are formed by the reaction of at least one polyfunctional compound with at least one compound of complimentary reactivity, e.g., a nucleophilic polyfunctional compound reacting with an electrophilic compound.Type: ApplicationFiled: February 26, 2010Publication date: September 1, 2011Applicant: Dionex CorporationInventors: Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Rong Lin
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Publication number: 20110174737Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.Type: ApplicationFiled: March 29, 2011Publication date: July 21, 2011Applicant: Dionex CorporationInventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
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Publication number: 20090289009Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.Type: ApplicationFiled: July 29, 2009Publication date: November 26, 2009Applicant: Dionex CorporationInventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
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Patent number: 7585679Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.Type: GrantFiled: February 22, 2008Date of Patent: September 8, 2009Assignee: Dionex CorporationInventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
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Publication number: 20090211979Abstract: Ion chromatography apparatus including (a) a chromatographic column, (b) a source of an aqueous eluent liquid stream, (c) a detector, (d) a recycle line between the detector and the chromatographic column, and (e) a purifying device disposed along the recycle line including ion exchange removal medium. Also, such apparatus with an electrolytic purifying device disposed along the recycle line. Also, methods of using such apparatus.Type: ApplicationFiled: February 25, 2008Publication date: August 27, 2009Applicant: DIONEX CORPORATIONInventors: Kannan Srinivasan, Rong Lin, Sheetal Bhardwaj, Christopher A. Pohl
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Publication number: 20090211980Abstract: A chromatographic method including chromatographically separating sample ionic species in an eluent stream, detecting the separated sample ionic species, catalytically combining hydrogen and oxygen gases or catalytically decomposing hydrogen peroxide in a catalytic gas elimination chamber, and recycling the effluent stream from the chamber to the chromatography separation column. The residence time between the detector and the chamber is at least about one minute. Also, flowing the recycle sequentially through two detector effluent flow channels of an electrolytic membrane suppressor. Also, applying heat or UV energy between the detector and the chamber. Also, detecting bubbles after the chamber. Also, a Platinum group metal catalyst and ion exchange medium in the chamber. Apparatus for performing the methods.Type: ApplicationFiled: February 22, 2008Publication date: August 27, 2009Applicant: DIONEX CORPORATIONInventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu