Patents by Inventor Purnendu Dasgupta
Purnendu Dasgupta 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: 20220205942Abstract: An electrochemical cell comprises a chamber, an inlet port, an outlet port, an electrode port, and a counter electrode. The inlet port is configured to allow flow of a liquid into the chamber and through an inlet opening toward the working electrode, and the outlet port is configured to allow flow of a liquid out of the chamber and through an outlet opening. The device is configured so that a force applied to the working electrode slides the first end face of the working electrode to a distance from a face of the inlet opening due to the balancing force of a fluid flowing out of the inlet opening. The device may be used in a method for analyzing an analyte, such as one or more amino acids in a liquid sample.Type: ApplicationFiled: December 27, 2021Publication date: June 30, 2022Inventors: Purnendu Dasgupta, Charles P. Shelor, Kannan Srinivasan, Christopher A. Pohl
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Patent number: 11369967Abstract: A cartridge comprises a housing; a sample mixing compartment disposed within the housing, the sample mixing compartment comprising: an activation pouch, and a sample collection region; and a gas transporter tube having a first end and a second end, the tube being disposed within the housing adjacent to the sample mixing compartment, wherein the sample mixing compartment is partially defined by a moveable door of the housing, the moveable door providing access to the sample mixing compartment when the door is in an open position and preventing access to the sample mixing compartment when the door is in a closed position; and wherein the door is configured to release contents of the activation pouch upon movement from the open position to the closed position.Type: GrantFiled: April 22, 2020Date of Patent: June 28, 2022Assignee: Board of Regents, The University of Texas SystemInventors: Purnendu Dasgupta, Aditya Das
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Patent number: 11199491Abstract: A photothermal absorbance detection apparatus comprises a flow cell comprising a first temperature responsive device on an input side, a second temperature responsive device on an output side, and a detection region between the first temperature responsive device and the second temperature responsive device; and a light-emitting device positioned proximate to the detection region and configured to transmit electromagnetic radiation towards the detection region; wherein the first temperature responsive device and the second temperature responsive device together measure a change in temperature of a fluid passing through the detection region.Type: GrantFiled: September 9, 2019Date of Patent: December 14, 2021Assignee: Board of Regents, the University of Texas SystemInventors: Purnendu Dasgupta, Bikash Chouhan
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Publication number: 20200338558Abstract: A cartridge comprises a housing; a sample mixing compartment disposed within the housing, the sample mixing compartment comprising: an activation pouch, and a sample collection region; and a gas transporter tube having a first end and a second end, the tube being disposed within the housing adjacent to the sample mixing compartment, wherein the sample mixing compartment is partially defined by a moveable door of the housing, the moveable door providing access to the sample mixing compartment when the door is in an open position and preventing access to the sample mixing compartment when the door is in a closed position; and wherein the door is configured to release contents of the activation pouch upon movement from the open position to the closed position.Type: ApplicationFiled: April 22, 2020Publication date: October 29, 2020Inventors: Purnendu DASGUPTA, Aditya DAS
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Publication number: 20200080930Abstract: A photothermal absorbance detection apparatus comprises a flow cell comprising a first temperature responsive device on an input side, a second temperature responsive device on an output side, and a detection region between the first temperature responsive device and the second temperature responsive device; and a light-emitting device positioned proximate to the detection region and configured to transmit electromagnetic radiation towards the detection region; wherein the first temperature responsive device and the second temperature responsive device together measure a change in temperature of a fluid passing through the detection region.Type: ApplicationFiled: September 9, 2019Publication date: March 12, 2020Inventors: Purnendu DASGUPTA, Bikash CHOUHAN
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Patent number: 10180394Abstract: In one embodiment, a cavity-enhanced absorption spectroscopy system includes a cavity-enhanced absorbance cell in which a liquid sample can be provided for purposes of evaluation, the absorbance cell having diffusely reflective inner surfaces, a light source configured to emit light into the liquid sample within the absorbance cell, and a light detector configured to capture the light after it has passed through the liquid sample.Type: GrantFiled: November 6, 2015Date of Patent: January 15, 2019Assignee: Board of Regents, The University of Texas SystemInventor: Purnendu Dasgupta
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Publication number: 20170315052Abstract: In one embodiment, a cavity-enhanced absorption spectroscopy system includes a cavity-enhanced absorbance cell in which a liquid sample can be provided for purposes of evaluation, the absorbance cell having diffusely reflective inner surfaces, a light source configured to emit light into the liquid sample within the absorbance cell, and a light detector configured to capture the light after it has passed through the liquid sample.Type: ApplicationFiled: November 6, 2015Publication date: November 2, 2017Inventor: PURNENDU DASGUPTA
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Patent number: 7964411Abstract: A sample concentrator for concentrating analytes in a solvent-containing liquid sample stream, including concentrator housing having a sample stream flow channel and a gas stream flow channel having an inlet and an outlet, a heater for gas in the gas stream conduit, and a hydrophilic ion exchange or non-ionic membrane barrier separating said gas stream flow channel and said sample stream flow channel. Solvent is evaporated from the liquid sample stream in said sample stream flow channel in or at the interface with said membrane, when the gas stream is at an elevated temperature. A regeneration step is used to regenerate the ion exchange membrane barrier.Type: GrantFiled: June 12, 2007Date of Patent: June 21, 2011Assignees: Dionex Corporation, Board of Regents, The University of TexasInventors: Purnendu Dasgupta, Masaki Takeuchi, Kannan Srinivasan
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Publication number: 20080311672Abstract: A sample concentrator for concentrating analytes in a solvent-containing liquid sample stream, including concentrator housing having a sample stream flow channel and a gas stream flow channel having an inlet and an outlet, a heater for gas in the gas stream conduit, and a hydrophilic ion exchange or non-ionic membrane barrier separating said gas stream flow channel and said sample stream flow channel. Solvent is evaporated from the liquid sample stream in said sample stream flow channel in or at the interface with said membrane, when the gas stream is at an elevated temperature. A regeneration step is used to regenerate the ion exchange membrane barrier.Type: ApplicationFiled: June 12, 2007Publication date: December 18, 2008Applicant: Dionex CorporationInventors: Purnendu Dasgupta, Masaki Takeuchi, Kannan Srinivasan
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Publication number: 20060037911Abstract: In a liquid chromatographic system, removing at least part of a volatile component from the liquid sample stream after separation by flowing it through a volatile component-removal device including a porous wall having a surface coating of a permeable polymer less than 10 ?m thick. A liquid chromatographic system suitable for performing the method. Also, a liquid chromatographic system in which volatile component is removed prior to separation across the same type of membrane or across a membrane made of a copolymer of perfluoro-2,2-dimethyl-1,3-dioxole.Type: ApplicationFiled: August 23, 2004Publication date: February 23, 2006Inventors: Purnendu Dasgupta, S. Ullah, Kannan Srinivasan
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Publication number: 20050244299Abstract: A method used to detect endotoxin uses a system (10) having bidirectional pump (20), multiport valve (30), fluid section valve (170), fluid holding member (50), solenoid valve (60), air source (63) and detector (100). Sample, LAL reagent and chromogenic substrate fluid segments are introduced into the holding member (50) between air segments, the reagents are then mixed and introduced into the detector (100) for measurement The system can be washed with an alkaline solution and followed by cthanol, or washed with tricthylaminc followed by water.Type: ApplicationFiled: April 30, 2003Publication date: November 3, 2005Applicant: BIOWITTAKER TECHNOLOGIES INCInventors: Purnendu Dasgupta, Ronald Berzofsky, Matthew Bonen
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Publication number: 20050202563Abstract: Apparatus and method for treating a liquid sample stream including at least one analyte ion species and matrix ion species of opposite charge to said one analyte ion species. The liquid sample stream flows through a treatment channel. A carrier liquid stream including a matrix ion species capture material flows substantially parallel to the sample stream in the treatment channel forms a liquid interface between them. The matrix ion species diffuses through the interface to contact and become bound by the capture material in said carrier liquid.Type: ApplicationFiled: August 28, 2003Publication date: September 15, 2005Inventors: Purnendu Dasgupta, Petr Kuban, Jordan Berg
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Publication number: 20050045032Abstract: A denuder assembly is adapted for the collection and removal of a gaseous analyte from a sample gas. The denuder includes a housing including an internal cavity, a sample gas inlet fluidly coupled with a sample gas source, a denuder liquid inlet fluidly coupled with a denuder liquid source, a barrier sheet extending across the internal cavity and separating the internal cavity into a liquid reservoir and a gas flow-through channel fluidly coupled with and downstream of the sample gas inlet, the barrier sheet having a liquid-reservoir surface and a gas-channel surface and being porous to gas and liquid; and a denuder liquid disposed in the liquid reservoir and permeating the barrier sheet to coat the gas-channel surface of the barrier sheet thereby allowing the denuder liquid on the gas-channel surface to contact the sample gas flowing within the gas flow-through channel and allowing the analyte to diffuse through the barrier sheet into the liquid reservoir.Type: ApplicationFiled: August 27, 2003Publication date: March 3, 2005Inventors: Purnendu Dasgupta, Kavin Morris, Jianzhong Li
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Patent number: 5433838Abstract: Improved capillary electrophoresis apparatus of the type that generally includes a capillary tube, the capillary tube having a sample inlet end and an outlet end, a first electrode in electrical communication with the inlet end of the capillary tube, a second electrode in electrical communication with the outlet end of the capillary tube and a high voltage power supply in electrical communication with the first and second electrodes. The improvement is to connect a miniature Ion Chromatography membrane suppressor to the outlet end of the capillary tube, to connect a conductivity detector to the membrane suppressor and to place the second electrode in the regenerant compartment of the membrane suppressor.Type: GrantFiled: June 10, 1994Date of Patent: July 18, 1995Assignee: The Dow Chemical CompanyInventors: Purnendu Dasgupta, Bao Li-Yuan
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Patent number: 4852632Abstract: Molten steel containing an undissolved alloying ingredient denser than molten steel (e.g. Pb and/or Bi) flows from a tundish to a continuous casting mold. Various expedients are employed to prevent large globules of undissolved alloying ingredient from flowing out of the tundish into the mold. Another expedient prevents large quantities of undissolved alloying ingredient from accumulating on the bottom of the tundish.Type: GrantFiled: October 17, 1988Date of Patent: August 1, 1989Assignee: Inland Steel Co.Inventors: Charles R. Jackson, Daniel Rellis, Jr., Howard M. Pielet, Debanshu Bhattacharya, Larry A. Frank, Purnendu Dasgupta, John R. Knoepke
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Patent number: 4754800Abstract: Molten steel containing an undissolved alloying ingredient denser than molten steel (e.g. Pb and/or Bi) flows from a tundish to a continuous casting mold. Various expedients are employed to prevent large globules of undissolved alloying ingredient from flowing out of the tundish into the mold. Another expedient prevents large quantities of undissolved alloying ingredient from accumulating on the bottom of the tundish.Type: GrantFiled: August 21, 1987Date of Patent: July 5, 1988Assignee: Inland Steel CompanyInventors: Charles R. Jackson, Daniel Rellis, Jr., Howard M. Pielet, Debanshu Bhattacharya, Larry A. Frank, Purnendu Dasgupta, John R. Knoepke
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Patent number: D921507Type: GrantFiled: April 23, 2019Date of Patent: June 8, 2021Assignee: BOARD OF REGENTS, THE UNIVERSITY OF TEXAS SYSTEMInventors: Purnendu Dasgupta, Aditya Das