Patents by Inventor Petr Jandik
Petr Jandik 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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Patent number: 9624588Abstract: A system and method to generate a concentration gradient eluent flow are described. The concentration gradient eluent flow can include at least two different generants. A liquid can be pumped to an eluent generating device. A first controlling signal can be applied to a first eluent generator to generate a first generant. A second controlling signal can be applied to a second eluent generator to generate a second generant. Either the first and/or the second controlling signal can be varied as a function of time to generate the concentration gradient eluent flow.Type: GrantFiled: June 15, 2015Date of Patent: April 18, 2017Assignee: Dionex CorporationInventors: Yan Liu, Petr Jandik, Christopher A. Pohl
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Publication number: 20150275380Abstract: A system and method to generate a concentration gradient eluent flow are described. The concentration gradient eluent flow can include at least two different generants. A liquid can be pumped to an eluent generating device. A first controlling signal can be applied to a first eluent generator to generate a first generant. A second controlling signal can be applied to a second eluent generator to generate a second generant. Either the first and/or the second controlling signal can be varied as a function of time to generate the concentration gradient eluent flow.Type: ApplicationFiled: June 15, 2015Publication date: October 1, 2015Inventors: Yan LIU, Petr JANDIK, Christopher A. POHL
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Patent number: 9086426Abstract: A system and method to generate a concentration gradient eluent flow are described. The concentration gradient eluent flow can include at least two different generants. A liquid can be pumped to an eluent generating device. A first controlling signal can be applied to a first eluent generator to generate a first generant. A second controlling signal can be applied to a second eluent generator to generate a second generant. Either the first and/or the second controlling signal can be varied as a function of time to generate the concentration gradient eluent flow.Type: GrantFiled: September 12, 2012Date of Patent: July 21, 2015Assignee: Dionex CorporationInventors: Yan Liu, Petr Jandik, Christopher A. Pohl
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Patent number: 8925374Abstract: A detection cell for a chromatography system includes a cell body having an inlet, an outlet, and a counter electrode, a working electrode, a sample flow passageway extending between the inlet and the outlet and in fluid contact with the counter and working electrodes, and a palladium/noble metal reference electrode system. A method of using the detection cell is also described.Type: GrantFiled: November 30, 2012Date of Patent: January 6, 2015Assignee: Dionex CorporationInventors: Jun Cheng, Petr Jandik, Christopher A. Pohl
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Publication number: 20140069176Abstract: A system and method to generate a concentration gradient eluent flow are described. The concentration gradient eluent flow can include at least two different generants. A liquid can be pumped to an eluent generating device. A first controlling signal can be applied to a first eluent generator to generate a first generant. A second controlling signal can be applied to a second eluent generator to generate a second generant. Either the first and/or the second controlling signal can be varied as a function of time to generate the concentration gradient eluent flow.Type: ApplicationFiled: September 12, 2012Publication date: March 13, 2014Inventors: Yan LIU, Petr JANDIK, Christopher A. POHL
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Publication number: 20130091936Abstract: A detection cell for a chromatography system includes a cell body having an inlet, an outlet, and a counter electrode, a working electrode, a sample flow passageway extending between the inlet and the outlet and in fluid contact with the counter and working electrodes, and a palladium/noble metal reference electrode system. A method of using the detection cell is also described.Type: ApplicationFiled: November 30, 2012Publication date: April 18, 2013Inventors: Jun CHENG, Petr JANDIK, Christopher A. POHL
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Patent number: 8342007Abstract: A detection cell for a chromatography system includes a cell body having an inlet, an outlet, and a counter electrode, a working electrode, a sample flow passageway extending between the inlet and the outlet and in fluid contact with the counter and working electrodes, and a palladium/noble metal reference electrode system. A method of using the detection cell is also described.Type: GrantFiled: February 10, 2010Date of Patent: January 1, 2013Assignee: Dionex CorporationInventors: Jun Cheng, Petr Jandik, Christopher A. Pohl
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Publication number: 20110192722Abstract: A detection cell for a chromatography system includes a cell body having an inlet, an outlet, and a counter electrode, a working electrode, a sample flow passageway extending between the inlet and the outlet and in fluid contact with the counter and working electrodes, and a palladium/noble metal reference electrode system. A method of using the detection cell is also described.Type: ApplicationFiled: February 10, 2010Publication date: August 11, 2011Applicant: Dionex CorporationInventors: Jun Cheng, Petr Jandik, Christopher A. Pohl
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Patent number: 7566392Abstract: In one embodiment, the present invention is directed to a pulsed electrochemical detection method comprising (a) flowing a liquid sample stream including at least one analyte past a working electrode in a flow-through cell; (b) applying at least three pulsed electrical potentials to the working electrode, (1) a first conditioning potential, (2) a second detection and oxidative cleaning potential, and (3) a third reductive cleaning potential, said second potential being higher than said first and third potentials and said first potential being higher than said third potential; and (c) detecting the output from said working electrode during the time period of applying said second potential.Type: GrantFiled: April 12, 2006Date of Patent: July 28, 2009Assignee: Dionex CorporationInventors: Jun Cheng, Petr Jandik, Xiaodong Liu, Christopher A. Pohl
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Publication number: 20070240998Abstract: In one embodiment, the present invention is directed to a pulsed electrochemical detection method comprising (a) flowing a liquid sample stream including at least one analyte past a working electrode in a flow-through cell; (b) applying at least three pulsed electrical potentials to the working electrode, (1) a first conditioning potential, (2) a second detection and oxidative cleaning potential, and (3) a third reductive cleaning potential, said second potential being higher than said first and third potentials and said first potential being higher than said third potential; and (c) detecting the output from said working electrode during the time period of applying said second potential.Type: ApplicationFiled: April 12, 2006Publication date: October 18, 2007Applicant: Dionex CorporationInventors: Jun Cheng, Petr Jandik, Xiaodong Liu, Christopher Pohl
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Publication number: 20040256216Abstract: A flow-through electrochemical cell assembly with a disposable working electrode structure, including (a) a perimeter wall defining a sample flow channel including an inlet and an outlet, (b) a sample inlet line in fluid communication with the sample flow channel inlet, (c) a sample outlet line providing fluid communication between the sample flow channel outlet and a remote reference electrode, and (d) a disposable working electrode structure comprising an electrically conductive and electrochemically active working electrode region bound as a layer, directly or indirectly, to an electrically insulating substrate surface. The substrate surface is in fluid-sealing relationship with the sample flow channel, and the working electrode region is in fluid communication with said sample flow channel. The working electrode is vapor deposited, directly or indirectly, onto the organic polymer substrate through a mask, and a fluid seal is formed between said working electrode region and perimeter wall.Type: ApplicationFiled: July 7, 2004Publication date: December 23, 2004Inventors: Jun Cheng, Petr Jandik, Nebojsa Avdalovic
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Patent number: 6783645Abstract: A flow-through electrochemical cell assembly with a disposable working electrode structure, including (a) a perimeter wall defining a sample flow channel including an inlet and an outlet, (b) a sample inlet line in fluid communication with the sample flow channel inlet, (c) a sample outlet line providing fluid communication between the sample flow channel outlet and a remote reference electrode, and (d) a disposable working electrode structure comprising an electrically conductive and electrochemically active working electrode region bound as a layer, directly or indirectly, to an electrically insulating substrate surface. The substrate surface is in fluid-sealing relationship with the sample flow channel, and the working electrode region is in fluid communication with said sample flow channel. The working electrode is vapor deposited, directly or indirectly, onto the organic polymer substrate through a mask, and a fluid seal is formed between said working electrode region and perimeter wall.Type: GrantFiled: February 20, 2002Date of Patent: August 31, 2004Assignee: Dionex CorporationInventors: Jun Cheng, Petr Jandik, Nebojsa Avdalovic
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Publication number: 20030111340Abstract: A flow-through electrochemical cell assembly with a disposable working electrode structure, including (a) a perimeter wall defining a sample flow channel including an inlet and an outlet, (b) a sample inlet line in fluid communication with the sample flow channel inlet, (c) a sample outlet line providing fluid communication between the sample flow channel outlet and a remote reference electrode, and (d) a disposable working electrode structure comprising an electrically conductive and electrochemically active working electrode region bound as a layer, directly or indirectly, to an electrically insulating substrate surface. The substrate surface is in fluid-sealing relationship with the sample flow channel, and the working electrode region is in fluid communication with said sample flow channel. The working electrode is vapor deposited, directly or indirectly, onto the organic polymer substrate through a mask, and a fluid seal is formed between said working electrode region and perimeter wall.Type: ApplicationFiled: February 20, 2002Publication date: June 19, 2003Applicant: Dionex CorporationInventors: Jun Cheng, Petr Jandik, Nebojsa Avdalovic
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Patent number: 5366601Abstract: A technique for separating, identifying and measuring ions in solution by capillary zone electrophoresis is described, which provides improved sensitivity and resolution of anionic species. The method involves introducing a sample containing the ionic species into a narrow bore capillary filled with a carrier electrolyte containing a selected light-absorbing anion. An electrical potential is applied across the capillary column causing the ions to elute according to their ionic mobility. Both UV absorbing and UV-transparent ions can be detected and quantitated by UV/visible photometric monitoring.Type: GrantFiled: October 20, 1992Date of Patent: November 22, 1994Assignee: Millipore CorporationInventors: William R. Jones, Petr Jandik
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Patent number: 5156724Abstract: A technique for separating, identifying and measuring ions in solution by capillary zone electrophoresis is described, which provides improved sensitivity and resolution of anionic and cationic species. The method involves introducing a sample containing the ionic species into a narrow core capillary filled with a carrier electrolyte containing a selected light-absorbing anion or cation to an electrical current in a capillary column causing the ions to elute according to their ionic mobility. Both UV absorbing and UV-transparent ions can be detected and quantitated by UV/Visible photometric monitoring.Type: GrantFiled: January 17, 1991Date of Patent: October 20, 1992Assignee: Millipore CorporationInventors: William R. Jones, Petr Jandik, Michael Merion, Andrea Weston
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Patent number: 5132018Abstract: An improved gradient ion chromatography process is disclosed. The process employs a gradient eluent which is maintained in a substantially isoconductive state throughout each sample run. By maintaining the gradient in an isoconductive state, conductivity detection and analysis of eluted analytes is enhanced.Type: GrantFiled: July 10, 1991Date of Patent: July 21, 1992Assignee: Millipore CorporationInventors: William R. Jones, Allan L. Heckenberg, Petr Jandik
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Patent number: 5128005Abstract: A technique for separating, identifying and measuring ions in solution by capillary zone electrophoresis is described, which provides improved sensitivity and resolution of anionic and cationic species. The method involves introducing a sample containing the ionic species into a narrow core capillary filled with a carrier electrolyte containing a selected light-absorbing anion or cation to an electrical current in a capillary column causing the ions to elute according to their ionic mobility. Both UV absorbing and UV-transparent ions can be detected and quantitated by UV/Visible photometric monitoring.Type: GrantFiled: November 25, 1991Date of Patent: July 7, 1992Assignee: Millipore CorporationInventors: William R. Jones, Petr Jandik, Michael Merion, Andrea Weston
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Patent number: 5104506Abstract: A technique for separating, identifying and measuring ions in solution by capillary zone electrophoresis is described, which provides improved sensitivity and resolution of anionic species. The method involves subjecting a sample containing the ionic species a light-absorbing material and a quaternary ammonium salt to an electrical current in a capillary column causing the ions to elute according to their ionic mobility. The ionic species are detected and quantitated by UV/Visible photometric monitoring.Type: GrantFiled: January 29, 1990Date of Patent: April 14, 1992Assignee: Millipore CorporationInventors: William R. Jones, Petr Jandik, Michael Merion
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Patent number: 4699718Abstract: A method and apparatus for the simultaneous analysis of borate and chloride ions in a liquid sample, such as a sample of nuclear reactor water, by ion chromatographic techniques are disclosed. The ion chromatographic system employed includes an exclusion column, an anion exchange column, and means for alternately directing effluent from said exclusion column to refractive index detecting means or void volume from the exclusion column and second eluent through the anion exchange column to conductivity detecting means.Type: GrantFiled: January 21, 1986Date of Patent: October 13, 1987Assignee: Millipore CorporationInventors: William R. Jones, Allan L. Heckenberg, Petr Jandik