Patents by Inventor Zhongqing Lu

Zhongqing Lu 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).

  • Publication number: 20210178334
    Abstract: An electrolytic eluent generator includes an electrolyte reservoir, an eluent generation chamber, and an ion exchange membrane stack. The electrolyte reservoir includes a chamber containing an aqueous electrolyte solution including an electrolyte and a surfactant; and a first electrode. The eluent generation chamber including a second electrode. The ion exchange connector includes an ion exchange membrane stack, and a compression block.
    Type: Application
    Filed: December 16, 2019
    Publication date: June 17, 2021
    Inventors: Zhongqing LU, Yan LIU, Christopher A. POHL, Jinhua CHEN, Jun CHENG
  • Patent number: 8802010
    Abstract: 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: Grant
    Filed: May 30, 2013
    Date of Patent: August 12, 2014
    Assignee: Dionex Corporation
    Inventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
  • Patent number: 8802011
    Abstract: 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: Grant
    Filed: May 30, 2013
    Date of Patent: August 12, 2014
    Assignee: Dionex Corporation
    Inventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
  • Publication number: 20130256232
    Abstract: 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: Application
    Filed: May 30, 2013
    Publication date: October 3, 2013
    Inventors: Yan LIU, Kannan SRINIVASAN, Christopher A. POHL, Sheetal BHARDWAJ, Zhongqing LU
  • Publication number: 20130259750
    Abstract: 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: Application
    Filed: May 30, 2013
    Publication date: October 3, 2013
    Inventors: Yan LIU, Kannan SRINIVASAN, Christopher A. POHL, Sheetal BHARDWAJ, Zhongqing LU
  • Patent number: 8465982
    Abstract: 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: Grant
    Filed: March 29, 2011
    Date of Patent: June 18, 2013
    Assignee: Dionex Corporation
    Inventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
  • Patent number: 8414684
    Abstract: A degas assembly including a low pressure fluid channel for carrying a wash fluid at a first pressure, a pressurized channel for carrying eluent including a gas at a second pressure higher than the first pressure, and a degas separator defining a fluid barrier between the low pressure fluid channel and pressurized fluid channel, the separator configured to retain liquid in the pressurized fluid channel and allow gas to flow through the separator to the low pressure fluid channel. The pressurized fluid channel may extend along an outer periphery of the low pressure fluid channel. The eluent may be received from an eluent generator at a pressure of at least about 3300 psi, and in various embodiments up to about 5000 psi. A liquid chromatography system and method are also disclosed.
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: April 9, 2013
    Assignee: Dionex Corporation
    Inventors: Yan Liu, Christopher A. Pohl, Michael McAdams, Hamish Small, Zhongqing Lu, Milton Liu, Khosro Moshfegh
  • Publication number: 20110290726
    Abstract: A degas assembly including a low pressure fluid channel for carrying a wash fluid at a first pressure, a pressurized channel for carrying eluent including a gas at a second pressure higher than the first pressure, and a degas separator defining a fluid barrier between the low pressure fluid channel and pressurized fluid channel, the separator configured to retain liquid in the pressurized fluid channel and allow gas to flow through the separator to the low pressure fluid channel. The pressurized fluid channel may extend along an outer periphery of the low pressure fluid channel. The eluent may be received from an eluent generator at a pressure of at least about 3300 psi, and in various embodiments up to about 5000 psi. A liquid chromatography system and method are also disclosed.
    Type: Application
    Filed: June 1, 2010
    Publication date: December 1, 2011
    Applicant: Dionex Corporation
    Inventors: Yan Liu, Christopher A. Pohl, Michael McAdams, Hamish Small, Zhongqing Lu, Milton Liu, Khosro Moshfegh
  • Publication number: 20110174737
    Abstract: 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: Application
    Filed: March 29, 2011
    Publication date: July 21, 2011
    Applicant: Dionex Corporation
    Inventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
  • Publication number: 20110054155
    Abstract: This invention relates to a technology used for a fast separation of Ginsenoside Re directly from other ginsensosides with similar molecular structures. In a conventional method, multiple steps and complex organic mobile phases are required to obtain a highly purified Ginsenoside Re compound, which are time consuming and organic solvent consumption, an obstacle for large scale industrial production. In our new technology, a quick separation for a mixture of two compounds with similar molecular structure. Ginsenoside Re and Ginsenoside Rg1 was demonstrated through a Surpass™ PolyGin-Re column 2×250 mm, in which only methanol was used for elution, no acids or bases were needed, which could be a Green technology for Ginsenoside Re production in the future.
    Type: Application
    Filed: August 28, 2009
    Publication date: March 3, 2011
    Inventor: Zhongqing Lu
  • Publication number: 20090289009
    Abstract: 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: Application
    Filed: July 29, 2009
    Publication date: November 26, 2009
    Applicant: Dionex Corporation
    Inventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
  • Patent number: 7585679
    Abstract: 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: Grant
    Filed: February 22, 2008
    Date of Patent: September 8, 2009
    Assignee: Dionex Corporation
    Inventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu
  • Publication number: 20090211980
    Abstract: 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: Application
    Filed: February 22, 2008
    Publication date: August 27, 2009
    Applicant: DIONEX CORPORATION
    Inventors: Yan Liu, Kannan Srinivasan, Christopher A. Pohl, Sheetal Bhardwaj, Zhongqing Lu