Only Nitrogen Dioxide Patents (Class 436/117)
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Patent number: 11202880Abstract: Inhalation of low levels of nitric oxide can rapidly and safely decrease pulmonary hypertension in mammals. A nitric oxide delivery system that converts nitrogen dioxide to nitric oxide employs a surface-active material, such as silica gel, coated with an aqueous solution of antioxidant, such as ascorbic acid.Type: GrantFiled: October 26, 2020Date of Patent: December 21, 2021Assignee: VERO Biotech LLCInventors: David P. Rounbehler, David H. Fine
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Patent number: 10814092Abstract: Inhalation of low levels of nitric oxide can rapidly and safely decrease pulmonary hypertension in mammals. A nitric oxide delivery system that converts nitrogen dioxide to nitric oxide employs a surface-active material, such as silica gel, coated with an aqueous solution of antioxidant, such as ascorbic acid.Type: GrantFiled: November 12, 2018Date of Patent: October 27, 2020Assignee: VERO Biotech LLCInventors: David P. Rounbehler, David H. Fine
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Patent number: 9379503Abstract: An electrified rail for metal shelving units, the rail comprising a body of electrically insulating material, provided with longitudinal slots. Each slot having a wire of electrically conducting metal surrounded for more than 180° of its cross section by the walls of the respective slot, the remaining section of the wires being exposed for electric contact. The body of the rail being formed to allow transversal elastic deformation of the rail itself after the surrounding and holding of the wires the slots are open on a visible planar side of the rail body with longitudinal mouths having a width always inferior to the diameter of wires, the wires being held in slots by the monolithic body of the rail itself, while through the narrow mouths of said slots every electric wire can be reached by the devices mounted on the rail.Type: GrantFiled: July 29, 2014Date of Patent: June 28, 2016Assignee: Cefla Societa' CooperativaInventors: Giancarlo Bonzi, Eros Nanni
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Patent number: 8895317Abstract: A compound represented by the general formula (I) [R1 and R2 are amino groups that substitute at adjacent positions on the benzene ring; R3 and R4 are halogen atoms; R5 and R6 represent hydrogen atom, an acyl group or an acyloxy(C1-6 alkyl) group; R7 and R8 represent —(CH2)p—N(R9)(R10) (p is 1 to 4, and R9 and R10 represent —(CH2)n—COOH (n is 1 to 4))], which is useful for measuring a reactive nitrogen species existing in cells such as nitrogen monoxide or peroxynitrite at high sensitivity over a long period of time.Type: GrantFiled: December 4, 2009Date of Patent: November 25, 2014Assignee: The University of TokyoInventors: Tetsuo Nagano, Yasuteru Urano, Saki Izumi
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Patent number: 8852950Abstract: A method for determining an NOx concentration in a measurement gas is provided, where a measurement value for the NOx concentration is determined from the sensor signal of a gas sensor and a measurement value for the concentration of a second component in the measurement gas is determined. A corrected value for the NOx in the measurement gas is determined from the measurement values, and the measurement value and the corrected measurement value for the NOx concentration are displayed and/or output.Type: GrantFiled: September 3, 2008Date of Patent: October 7, 2014Assignee: Testo AGInventors: Knut Hoyer, Andreas Kaufmann, Reinhold Munch, Thomas Springmann
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Patent number: 8846407Abstract: A method and device for detecting explosive compounds in an air sample in which the air sample is filtered with activated carbon treated with a weakly basic solution, after which the air sample is divided into two parts, with one part being heated at lower temperatures to decompose non-explosive nitrogenous compounds and the second part being heated at higher temperatures to decompose explosive nitrogenous compounds. Nitrogen dioxide is measured in both portions of the air sample with a spectrographic detector, and the presence or absence of explosive nitrogenous compounds in the air sample is determined.Type: GrantFiled: June 15, 2012Date of Patent: September 30, 2014Inventor: James M. Hargrove
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Publication number: 20140127824Abstract: A method for the detection of explosives using a single sample. The explosives include nitro aliphatic and nitro aromatic-based explosives. The method includes steps which require different pHs to discriminate between these types of explosives and at least in the detection step of the nitro aliphatic explosive requires the presence of a nitro aromatic compound. A kit for detecting explosives which includes a medium for collecting a sample, a base optionally impregnated on the medium; and a nitro aromatic solution for detecting a nitro aliphatic explosive by contacting the solution with the sample on the medium. A reagent including a nitro aromatic compound, having one or more additional electron withdrawing groups, in the presence of a basic compound usable for detecting nitro aliphatic explosives.Type: ApplicationFiled: June 27, 2012Publication date: May 8, 2014Applicant: MISTRAL DETECTION LTD.Inventor: Shai Amisar
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Patent number: 8685742Abstract: The present invention relates to an apparatus and a method for the more efficient cleaning of nucleic acids, and to a kit for carrying out this method.Type: GrantFiled: July 15, 2005Date of Patent: April 1, 2014Assignee: Qiagen GmbHInventor: Thorsten Singer
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Patent number: 8632991Abstract: Aspects of the invention include methods for enhancing blood coagulation in a subject. In practicing methods according to certain embodiments, an amount of a non-anticoagulant sulfated polysaccharide (NASP) is administered to a subject to enhance blood coagulation in the subject. Also provided are methods for preparing a NASP composition having blood coagulation enhancing activity. Compositions and kits for practicing methods of the invention are also described.Type: GrantFiled: January 13, 2011Date of Patent: January 21, 2014Assignees: Baxter International Inc., Baxter Healthcare S.A.Inventors: Michael Dockal, Hartmut Ehrlich, Friedrich Scheiflinger
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Patent number: 8563319Abstract: A nitrogen dioxide sensor comprising a first beam having a first functionalized sensing surface capable of sensing nitrogen dioxide, the first beam capable of producing a first resonant frequency; and a second beam having a second functionalized reference surface not capable of sensing nitrogen dioxide, the second beam capable of producing a second resonant frequency, wherein differential sensing of nitrogen dioxide may be performed, further wherein the first beam and the second beam are each functionalized with one or more soft bases having comparable viscoelastic properties is provided. In one embodiment, the sensor is a nano-sensor capable of low drift and accurate detection of nitrogen dioxide levels at the zeptogram level. Methods of making and using a nitrogen dioxide sensor are also provided.Type: GrantFiled: December 7, 2010Date of Patent: October 22, 2013Assignee: Honeywell Romania S.R.L.Inventors: Bogdan Catalin Serban, Cornel P. Cobianu, Mihai N. Mihaila, Viorel Georgel Dumitru, Octavian Buiu
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Publication number: 20130224872Abstract: The present disclosure relates to a gas sensor, including: a gas collecting chamber including: (a) a nanoporous wall including alumina, on a portion of the gas collecting chamber in the near vicinity of the solid propellant fuel; a micro pump attached to the gas collecting chamber; and a gas analysis device connected to the gas collecting chamber. The gas analysis device measures both type and concentration of gases collected in the gas collecting chamber via the nanoporous wall, the gases measured being selected from the group consisting of CO, CO2, NO, N2O, NO2 and combinations thereof. The present disclosure also relates to a method of sensing propellant degradation in solid fuel and a method of using a gas collecting chamber to sense such degradation.Type: ApplicationFiled: February 27, 2012Publication date: August 29, 2013Applicant: United States of America as represented by the Secretary of the ArmyInventors: Christina L. Brantley, Eugene Edwards, Paul B. Ruffin, Fang Luo
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Patent number: 8507288Abstract: The invention relates to the use of carbon nanomaterials as a filtration material pervious to nitrogen dioxide and impervious to ozone. The invention also relates to the use of carbon nanomaterials having a specific surface, measured by the BET method, of 15 to 40 m2/g inclusive and a form factor, equal to the ratio (highest dimension/lowest dimension) of the nanomaterial, of 5 to 250 inclusive, as material for filtering a gas mixture containing nitrogen dioxide and ozone, being pervious to the nitrogen dioxide and impervious to the ozone. The invention can be used in the field of air pollution.Type: GrantFiled: May 27, 2009Date of Patent: August 13, 2013Assignees: Centre National de la Recherche Scientifique, Universite Blaise Pascal—Clermont—Ferrand IIInventors: Alain Pauly, Marc Dubois, Katia Guerin, André Hamwi, Jérôme Brunet, Christelle Varenne, Bernard Lauron
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Patent number: 8440466Abstract: The nitrogen oxide analyzer obtains the ozone concentration-luminescence response characteristics that show the relationship between the ozone concentration and the light intensity by chemiluminescent response obtained by varying the ozone concentration alone in a steady state, and sets the relationship of the parameter that determines an average period of the sample gas passing the reactor so that the luminescence response is generated in the reactor alone even though the ozone concentration of the ozone-containing gas changes within a predetermined range based on the ozone concentration-luminescence response characteristics.Type: GrantFiled: April 4, 2006Date of Patent: May 14, 2013Assignee: Horiba, Ltd.Inventor: Hiroshi Nakamura
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Publication number: 20130017618Abstract: A method and device for detecting explosive compounds in an air sample in which the air sample is filtered with activated carbon treated with a weakly basic solution, after which the air sample is divided into two parts, with one part being heated at lower temperatures to decompose non-explosive nitrogenous compounds and the second part being heated at higher temperatures to decompose explosive nitrogenous compounds. Nitrogen dioxide is measured in both portions of the air sample with a spectrographic detector, and the presence or absence of explosive nitrogenous compounds in the air sample is determined.Type: ApplicationFiled: June 15, 2012Publication date: January 17, 2013Inventor: James Hargrove
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Publication number: 20120282594Abstract: Sensors based on single-walled carbon nanotubes and graphene which demonstrate extreme sensitivity as reflected in their electrical conductivity to gaseous molecules, such as NO, NO2 and NH3, when exposed to in situ ultraviolet (UV) illumination during measurement of the analytes are disclosed. The sensors are capable of detection limits of NO down to almost 150 parts-per-quadrillion (“ppq”), detection limits of NO2 to 2 parts-per-trillion (“ppt”), and detection limits of NH3 of 33 ppt.Type: ApplicationFiled: May 8, 2012Publication date: November 8, 2012Applicant: HONDA MOTOR CO., LTD.Inventors: Gugang CHEN, Avetik R. HARUTYUNYAN
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Patent number: 8178355Abstract: The present invention relates to the field of detection of components in gas phase, and in particular to detection of nitric oxide exhaled as a component of breath, using a liquid crystal assay format and a device utilizing liquid crystals as part of a reporting system.Type: GrantFiled: September 15, 2009Date of Patent: May 15, 2012Assignee: Platypus Technologies, LLC.Inventors: Bharat Acharya, Avijit Sen, Nicholas Abbott, Kurt Kupcho
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Publication number: 20110143447Abstract: A nitrogen dioxide sensor comprising a first beam having a first functionalized sensing surface capable of sensing nitrogen dioxide, the first beam capable of producing a first resonant frequency; and a second beam having a second functionalized reference surface not capable of sensing nitrogen dioxide, the second beam capable of producing a second resonant frequency, wherein differential sensing of nitrogen dioxide may be performed, further wherein the first beam and the second beam are each functionalized with one or more soft bases having comparable viscoelastic properties is provided. In one embodiment, the sensor is a nano-sensor capable of low drift and accurate detection of nitrogen dioxide levels at the zeptogram level. Methods of making and using a nitrogen dioxide sensor are also provided.Type: ApplicationFiled: December 7, 2010Publication date: June 16, 2011Applicant: Honeywell Romania S.R.L.Inventors: Bogdan Catalin Serban, Cornel P. Cobianu, Mihai N. Mihaila, Viorel Georgel Dumitru, Octavian Buiu
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Publication number: 20110124112Abstract: The invention relates to the use of carbon nanomaterials as a filtration material pervious to nitrogen dioxide and impervious to ozone. The invention also relates to the use of carbon nanomaterials having a specific surface, measured by the BET method, of 15 to 40 m2/g inclusive and a form factor, equal to the ratio (highest dimension/lowest dimension) of the nanomaterial, of 5 to 250 inclusive, as material for filtering a gas mixture containing nitrogen dioxide and ozone, being pervious to the nitrogen dioxide and impervious to the ozone. The invention can be used in the field of air pollution.Type: ApplicationFiled: May 27, 2009Publication date: May 26, 2011Inventors: Alain Pauly, Marc Dubois, Katia Guerin, André Hamwi, Jérôme Brunet, Christelle Varenne, Bernard Lauron
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Publication number: 20110027899Abstract: Embodiments of the invention are directed to an apparatus and method for detecting explosive compounds by air sampling followed by subjecting the air sample to a detection method. In one embodiment, a test area is sampled by drawing air from the vicinity of the test area, heating or irradiating the air sample and subjecting the irradiated sample to a detection method. With respect to nitrogen-containing explosive compounds, heating or irradiating the air sample produces nitrogen dioxide (NO2). With respect to non-nitrogen-containing explosive compounds (e.g., oxygen-containing explosive compounds), the air sample may be exposed to a source of nitrogen monoxide (NO) to generate nitrogen dioxide (NO2). With respect to nitrogen-containing samples that preferentially generate nitrogen monoxide (NO) rather than nitrogen dioxide (NO2), gas titration may be integrated into the system to convert nitrogen monoxide (NO) to nitrogen dioxide (NO2).Type: ApplicationFiled: February 10, 2010Publication date: February 3, 2011Inventor: James M. Hargrove
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Patent number: 7871823Abstract: Data on a secular change of each denitration catalyst is managed based on data obtained by a periodic maintenance and a daily management. Management of a secular change and prediction on performance variations that occur until a next periodic check is performed. It is determined whether the denitration catalyst is deteriorated such that an exhaust-gas denitration system cannot maintain its performance. When the denitration catalyst is deteriorated, regeneration, replacement, or addition of the denitration catalyst is performed, and the denitration catalyst is altered as necessary. When the denitration catalyst is usable, the denitration catalyst is not replaced nor regenerated.Type: GrantFiled: March 26, 2009Date of Patent: January 18, 2011Assignee: The Chugoku Electric Power Co., Inc.Inventors: Hiroshi Shimada, Yousuke Oka
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Patent number: 7781220Abstract: A method of determining the amount of nitrogen in a gas mixture. The constituent gases of the mixture are dissociated and transformed to create a substance that may measured using nondispersive infrared adsorption techniques.Type: GrantFiled: December 20, 2006Date of Patent: August 24, 2010Assignee: Southwest Research InstituteInventors: Thomas E. Owen, Michael A. Miller
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Patent number: 7771654Abstract: An apparatus for monitoring ammonia in gaseous streams, particularly in flue gas streams. The apparatus is transportable but can be permanently installed. The flue gas can be monitored in real time.Type: GrantFiled: September 7, 2006Date of Patent: August 10, 2010Inventors: Randall P. Moore, Robert L. Mullowney, Jr.
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Patent number: 7759122Abstract: The present invention provides a method of testing an NOx removal catalyst, which method enables assessment of actual catalytic performance in consideration of gas flow condition in the gas conduits of the NOx removal catalyst.Type: GrantFiled: June 21, 2005Date of Patent: July 20, 2010Assignee: The Chugoku Electric Power Co., Inc.Inventors: Tsuyoshi Chiyonobu, Hatsumi Chiyonobu, legal representative, Hiroshi Shimada
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Patent number: 7635593Abstract: Localized catalyst activity in an SCR unit for controlling emissions from a boiler, power plant, or any facility that generates NOx-containing flue gases is monitored by one or more modules that operate on-line without disrupting the normal operation of the facility. Each module is positioned over a designated lateral area of one of the catalyst beds in the SCR unit, and supplies ammonia, urea, or other suitable reductant to the catalyst in the designated area at a rate that produces an excess of the reductant over NOx on a molar basis through the designated area. Sampling probes upstream and downstream of the designated area draw samples of the gas stream for NOx analysis, and the catalyst activity is determined from the difference in NOx levels between the two probes.Type: GrantFiled: April 21, 2005Date of Patent: December 22, 2009Assignee: Fossil Energy Research Corp. (FERCO)Inventors: Lawrence J. Muzio, Randall A. Smith
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Patent number: 7575931Abstract: Disclosed herein is a method and apparatus for reducing a nitrogen oxide, and the control thereof.Type: GrantFiled: June 18, 2003Date of Patent: August 18, 2009Assignee: E.I. du Pont de Nemours and CompanyInventors: John Carl Steichen, Patricia A. Morris, John James Barnes
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Patent number: 7323343Abstract: An analytical system is provided for determining nitrogen monoxide, nitrogen dioxide and ozone concentrations in air samples. An ultraviolet light source 4 is used to alter the equilibrium between nitrogen dioxide and oxygen on the one hand and nitrogen monoxide and ozone on the other. Dynamic measurement of ozone concentration with time while ultraviolet irradiation is pulsed enables each gas concentration to be calculated without requiring input gases to be scrubbed. An aApparatus 101 is further provided to provide a controlled flow of gas to a sensor 103 attached to a high altitude balloon while sheltering it from the elements and allowing for affects of temperature, said apparatus comprising a shield 104 and a gas conducting means which uses the venturi effect to control air flow or has a hole to allow water to drain without affecting air flow past the sensor.Type: GrantFiled: July 13, 2004Date of Patent: January 29, 2008Assignee: Cambridge University Technical Services LimitedInventors: Richard Anthony Cox, Roderic Lewis Jones
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Patent number: 7297549Abstract: A method of determining bias in a measurement of a constituent concentration level in a sample gas is provided. The method comprises establishing a sample gas flow from an emission stream into a sample gas line of an emissions monitoring system. The method further comprises removing water from the sample gas flow and cooling the sample gas flow to a temperature below about 41° F. to produce a cooled, dried sample gas flow. The constituent concentration level is then determined for the cooled, dried sample gas flow. The method further comprises introducing a span gas having a known span gas constituent concentration level into the sample gas flow to form a combined sample and span gas flow, the span gas being introduced at a desired span gas flow rate. The method still further comprises removing water from the combined sample and span gas and cooling the combined sample and span gas to a temperature below about 41° F. to produce a cooled, dried, combined sample and span gas flow.Type: GrantFiled: March 6, 2002Date of Patent: November 20, 2007Assignee: General Electric CompanyInventors: William Steven Lanier, Glenn England
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Patent number: 7029920Abstract: A method and system for determining a concentration level of NOx in an exhaust stream from a combustion source. The method comprises capturing sample gas from the exhaust stream using a sampling device. NO2 in the sample gas is converted to NO by passing the sample gas through a catalytic NO2 converter. The method also comprises removing water from the sample gas by passing the sample gas through a dryer and determining a sample gas NO concentration level. The step of converting NO2 is performed at a temperature above the dew point temperature of the sample gas.Type: GrantFiled: October 31, 2001Date of Patent: April 18, 2006Assignee: General Electric CompanyInventors: William Steven Lanier, Glenn England
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Patent number: 6878339Abstract: The present invention provides a NOx-concentration measuring apparatus D for quantitatively analyzing the concentration of NOx contained in a sample gas. The measuring apparatus D comprises a sampling probe for obtaining the sample gas, a drain separator 2 for condensing moisture contained in the sample gas as a condensed water and separating the condensed water from the sample gas, an NO2 converter 3 for converting NO2 contained in the sample gas into NO, a secondary cooling device 7 for additionally cooling the sample gas, and an NO analyzer 1, arranged in this order with respect to a sample-gas line of the NOx-concentration measuring apparatus. The drain separator is a high-flow-velocity cooling type drain separator. Further, the sample-gas line between the sampling probe and the drain separator is heated and/or thermally insulated over the entire length thereof. The measuring apparatus can provide a high-precision measurement while suppressing NO2 loss.Type: GrantFiled: February 19, 2003Date of Patent: April 12, 2005Assignee: Horiba, Ltd.Inventors: Shigeyuki Akiyama, Satoshi Inoue, Masahiko Fujiwara
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Patent number: 6867047Abstract: Methods and apparatus are described for preventing nitrogen interference in the detection of a substance. In particular, it relates to new methods and apparatus for preventing interference due to nitrogen in pyro-electrochemical methods for measuring substances, for example sulfur content, contained within liquids such as petroleum products and beverages. One preferred apparatus and method comprises a catalytic converter or thermal converter to selectively remove the nitrogen-containing interferant, for example NO2, in the pyrolyzed gas stream to NO without affecting the sulfur content. A second preferred apparatus and method comprises a chemical scrubber to selectively remove the nitrogen-containing interferant from the gas stream without affecting the sulfur content.Type: GrantFiled: January 23, 2002Date of Patent: March 15, 2005Assignee: Spectro Analytical InstrumentsInventor: John R. Rhodes
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Patent number: 6780378Abstract: A method and apparatus for measuring the concentration of at least one gaseous component and/or vaporous component of a gaseous mixture in which a controlled sensor flame is introduced into the gaseous mixture and at least one narrow spectral band in the controlled sensor flame is optically measured. The concentration of the gaseous component using a result obtained from the optical measuring of the at least one narrow spectral band is then calculated. The method of this invention is particularly suitable for substantially real-time control of combustion processes.Type: GrantFiled: June 28, 2001Date of Patent: August 24, 2004Assignee: Gas Technology InstituteInventors: Hamid A. Abbasi, David M. Rue
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Publication number: 20040053421Abstract: A compact scanning apparatus has an infrared laser adapted to emit light. The light is delivered as a beam by an optical system to illuminate an interrogation area on the surface of an object being scanned. Such illumination has sufficient intensity and duration to cause selective desorption of molecules of the contraband substance, which are present on the surface, without substantially damaging the surface. A collection system collects at least a portion of the desorbed molecules. At least a portion of the collected molecules is thermally decomposed to form NO2 and transferred to a reaction cell containing an aqueous, alkaline, luminol-containing solution. The NO2 reacts with the luminol to produce light by chemiluminescence. A light detector registers the presence of this light as indicative of the detection of the contraband substance, and activates a signaling device to provide an audible or visible alarm.Type: ApplicationFiled: September 12, 2002Publication date: March 18, 2004Inventors: Dao Hinh Nguyen, Stewart Berry, Jan Prot Geblewicz, Guy Couture, Phuong Huynh
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Patent number: 6635415Abstract: The concentration of nitric oxide in a gas is determined by oxidizing NO to NO2 and then measuring the concentration of NO2 in the gas, which is proportional to the concentration of NO. Preferably, gaseous NO2 molecules diffuse through a plurality of capillary membrane fibers and undergo a chemiluminescent reaction with a reagent flowing within; the light from the reaction is measured to determine NO2 concentration. In another aspect of a preferred embodiment, gas is passed through a scrubber before the concentration of NO2 is measured, in order to substantially remove carbon dioxide and ambient NO2 from the gas without substantially affecting the concentration of nitric oxide therein.Type: GrantFiled: April 19, 2000Date of Patent: October 21, 2003Assignee: 2B Technologies, Inc.Inventors: Mark J. Bollinger, John W. Birks, Jill K. Robinson
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Patent number: 6623699Abstract: An analyzer compensates for gas flow perturbations by providing a makeup flow of carrier gas to maintain the pressure and/or flow rate of analyte and inert gas through a detector constant such that a accurate determination of a low concentration of an analyte in the presence of a high concentration of a second analyte can be accurately determined. In one embodiment, a carrier gas is introduced through a valve responsive to the detected pressure in the gas flow stream between a scrubber and a subsequent detector for maintaining the pressure constant during an analysis. In another embodiment of the invention, a flow transducer is positioned in the gas flow path between the scrubber and detector and coupled to a flow control valve coupled to introduce carrier gas as a function of detected gas flow such that the flow rate of gas into the detector is maintained constant.Type: GrantFiled: November 15, 2000Date of Patent: September 23, 2003Assignee: Leco CorporationInventors: Brian W. Pack, Carlos Guerra, Peter M. Willis, Joel C. Mitchell
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Patent number: 6593095Abstract: The present invention relates to toxins that specifically bind to GPI anchored proteins. More specifically, the present invention encompasses the uses of such toxins to detect the presence or absence of GPI anchored proteins. In one embodiment the present invention can be used to detect the presence of paroxysmal nocturnal hemoglobinuria.Type: GrantFiled: July 14, 2000Date of Patent: July 15, 2003Assignees: University of Victoria Innovation and Development Corporation, Johns Hopkins UniversityInventors: J. Thomas Buckley, Robert A. Brodsky
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Publication number: 20030049855Abstract: Methods and apparatus are described for preventing nitrogen interference in the detection of a substance. In particular, it relates to new methods and apparatus for preventing interference due to nitrogen in pyro-electrochemical methods for measuring substances, for example sulfur content, contained within liquids such as petroleum products and beverages. One preferred apparatus and method comprises a catalytic converter or thermal converter to selectively remove the nitrogen-containing interferant, for example NO2, in the pyrolyzed gas stream to NO without affecting the sulfur content. A second preferred apparatus and method comprises a chemical scrubber to selectively remove the nitrogen-containing interferant from the gas stream without affecting the sulfur content.Type: ApplicationFiled: January 23, 2002Publication date: March 13, 2003Applicant: Spector Analytical InstrumentsInventor: John R. Rhodes
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Publication number: 20030003590Abstract: A method and apparatus for measuring the concentration of at least one gaseous component and/or vaporous component of a gaseous mixture in which a controlled sensor flame is introduced into the gaseous mixture and at least one narrow spectral band in the controlled sensor flame is optically measured. The concentration of the gaseous component using a result obtained from the optical measuring of the at least one narrow spectral band is then calculated. The method of this invention is particularly suitable for substantially real-time control of combustion processes.Type: ApplicationFiled: June 28, 2001Publication date: January 2, 2003Inventors: Hamid A. Abbasi, David M. Rue
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Publication number: 20020164814Abstract: The present invention provides a method and apparatus for accurately determining weight loss of a sample during heating in a furnace. The method includes the steps of placing a sample in a heated furnace, heating the sample while measurements of sample weight are made, determining rate function from the sample weight measurements, producing a weight loss correction factor using the rate function and using the weight loss correction factor to obtain a corrected weight loss for the sample.Type: ApplicationFiled: June 25, 2002Publication date: November 7, 2002Applicant: Troxler Electronic Laboratories, Inc.Inventor: Robert Ernest Troxler
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Patent number: 6362005Abstract: In this invention, a mixture of a diazotizing reagent which reacts with nitrous ions to produce a diazo compound, a coupling reagent which couples with a diazo compound to produce an azo dye, and an acid is placed in pores of a transparent porous body to prepare a sensor element. Nitrogen dioxide gas is sensed in accordance with a color change before and after the sensor element is exposed to air to be measured for a predetermined time.Type: GrantFiled: August 24, 1998Date of Patent: March 26, 2002Assignee: Nippon Telegraph and Telephone CorporationInventors: Tohru Tanaka, Takayoshi Hayashi, Shiro Matsumoto, Yasuko Maruo, Takashi Ohyama
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Publication number: 20020031447Abstract: An optical gas sensor for determining a gas in a gas mixture, especially for determining a gas component in the air, is described, having a radiation source and having a sensitive layer positioned on a substrate. The sensitive layer of the sensor is porous and contains particles, which are optically transparent to a radiation emitted by radiation source and which lengthen the optical path of the radiation.Type: ApplicationFiled: June 22, 2001Publication date: March 14, 2002Inventors: Thomas Brinz, Heidrun Potthast
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Publication number: 20020028518Abstract: An optical sensor is proposed for determining gases in gas mixtures, especially for determining one gas component in the air, having a sensitive layer exposed to the gas and having a means for detecting a change in an optical property of the sensitive layer. The sensitive layer of the sensor contains a phosphorus or nitrogen-containing base having numerous and/or long-chain alkyl groups for the pH adjustment of the sensitive layer.Type: ApplicationFiled: June 28, 2001Publication date: March 7, 2002Inventors: Thomas Brinz, Heidrun Potthast
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Patent number: 6346419Abstract: An efficient, lightweight, and relatively inexpensive photolysis system based on a short-arc Hg arc lamp provides a simple and accurate method for measurement of ambient NO2. High time resolution is achieved by minimizing inlet and photolysis cell residence times and matching NO and NO2 sample paths, and data reduction is greatly simplified relative to conventional photolysis designs.Type: GrantFiled: June 26, 2000Date of Patent: February 12, 2002Assignee: The United States of America as represented by the Department of CommerceInventors: Thomas B. Ryerson, Eric J. Williams
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Patent number: 6100096Abstract: A detector for detecting and measuring nitric oxide. Gas-permeable capillary membrane fibers transport a reagent solution through a plenum containing gases to be measured. Nitric oxide molecules penetrate the walls of the fibers and undergo a chemiluminescent reaction within. The fibers and the plenum are translucent, allowing photons emitted by the chemiluminescent reaction to escape and be detected by a photodetector. The reagent is buffered at an alkaline pH and mixed with the enzyme carbonic anhydrase to minimize the measurement errors caused by the presence of carbon dioxide in the gas to be measured.Type: GrantFiled: March 9, 1998Date of Patent: August 8, 2000Assignee: 2B Technologies, Inc.Inventors: Mark J. Bollinger, John W. Birks, Jill K. Gregory
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Patent number: 5976889Abstract: A method and apparatus for detecting NO.sub.x by chemiluminescence. The apparatus includes a sample gas line having an inlet port for receiving a sample gas, a NO.sub.x converter connected to the sample gas line, a N.sub.2 diluting gas line connected to the sample gas line upstream from the NO.sub.x converter, a bypass exhaust lie connected to the sample gas line, and a chemiluminescence analyzer connected to the NO.sub.x converter. The sample gas, which contains a NO.sub.x component, is introduced to the sample gas line through an inlet portion. The sample gas is diluted with nitrogen gas from the nitrogen diluting gas line, and the NO.sub.x component in the sample gas is converted to NO by the NO.sub.x converter. The chemiluminescence analyzer detects the NO.sub.x component.Type: GrantFiled: October 8, 1997Date of Patent: November 2, 1999Assignee: Horiba Ltd.Inventors: Hitoshi Hirai, Masaru Miyai
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Patent number: 5976888Abstract: A method for measuring NO.sub.x in biochemical processes which includes a) isolating a liquid sample; b) adjusting the pH or ionic strength of the sample; c) recording mV values present in the sample after predetermined time periods; d) determining NO.sub.x concentrations in the sample at each of the predetermined time periods from the mV values; e) determining the difference in NO.sub.x in the sample from the NO.sub.x concentrations at each of the predetermined time periods; and f) determining the NO.sub.x concentration of the liquid sample from the difference in NO.sub.x and the predetermined time periods.Type: GrantFiled: December 7, 1998Date of Patent: November 2, 1999Assignee: BioChem Technology, Inc.Inventors: Jaw Fang Lee, Sergey K. Maneshin, Marcus E. Kolb, Xin Yang
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Patent number: 5906946Abstract: The excitation of the target nitrocompound with ultraviolet radiation ress in photodissociation yielding vibrationally excited NO with significant population of the v"=1 and v"=2 levels of the ground electronic state. As the population distribution of ambient NO favors the v"=0 level, discrimination between vibrationally excited NO and ambient NO is possible by probing the NO A-X (0,0),(1,1), and (2,2) bands near 226, 224, and 222 nm, respectively, employing (1+1) resonance-enhanced multiphoton ionization (REMPI). Many complex nitrocompounds cannot be photolyzed near 452 nm since their absorption cross sections are relatively small. Thus, the visible laser radiation is used to facilitate the detection of ambient NO and NO from NO.sub.2 by (2+2) REMPI and to discriminate these species from more complex nitrocompound analytes. The analytical utility of the present invention has been demonstrated at several photolysis/ionization wavelengths for NO/CH.sub.3 NO.sub.2 and NO.sub.2 /CH.sub.3 NO.sub.2 mixtures.Type: GrantFiled: August 5, 1996Date of Patent: May 25, 1999Assignee: United States of America as represented by the Secretary of The ArmyInventors: Rosario C. Sausa, Robert Pastel
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Patent number: 5891735Abstract: Nitrosyl (FeII) hemoglobin can be detected in biological samples, using a method which involves injections of samples into a photolysis cell, prior to detection of chemiluminescence generated by the reaction between nitric oxide and ozone. This method is useful for monitoring the levels of nitric oxide bioactivity in both normal physiological states, and disease states, such as septic shock, atherosclerosis, thrombosis, hyperhomocysteinemia, pulmonary hypertension, malignancy, infections and central nervous system disorders.Type: GrantFiled: March 15, 1996Date of Patent: April 6, 1999Assignee: Duke University Medical CenterInventor: Jonathan S. Stamler
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Patent number: 5866075Abstract: A device for sensing ammonia (NH.sub.3) and nitrogen oxide (NO.sub.x) gases comprising: a sensor for detecting said ammonia and said nitrogen oxide gases, said sensor including a substrate and a layer consisting of cuprate material for detection of said ammonia and said nitrogen oxide gases, wherein said layer of cuprate material is selected from the group consisting of Y:Ba:Cu:O (YBCO) and Bi:Sr:Ca:Cu:O (BSCCO); a sensor holder for supporting said sensor; a perforated cap positioned over said sensor, said perforated cap having openings for passage of said ammonia and said nitrogen oxide gases to said sensor; a detection circuit communicating with said sensor for measuring output from said sensor; and a display or recording device connected to said detection circuit for displaying or recording a concentration of said ammonia and said nitrogen oxide gases based on the output from said sensor.Type: GrantFiled: December 29, 1997Date of Patent: February 2, 1999Assignee: Council of Scientific and Industrial ResearchInventors: Ram Pratap Gupta, Purushottam Das Vyas, Zenko Gergintschew, Dagmar Schipanski
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Patent number: 5863503Abstract: A nitrogen oxide detecting sensor, according to the present invention, incorporates a gas detecting portion including, as a main component thereof, an oxide compound having electric conductivity or semiconductivity, the oxide compound having a crystal structure of 2212 phase and expressed generally as: Bi.sub.2 Sr.sub.2 (Ca.sub.1-x Y.sub.x)Cu.sub.2 O.sub.8.+-..delta. where 0.6.ltoreq.x<1; 0.ltoreq..delta..ltoreq.1. Electrodes are electrically connected to the gas detecting portion. When the gas detecting portion is analyzed by X-ray diffraction using cuK.alpha. rays to obtain diffraction peak values thereof in the range of a diffraction angle between 5.degree. and 65.degree., the diffraction peak values having a sum .SIGMA. I?2212! expressed by one of the following:(a) .SIGMA. I?2212!/.SIGMA. I?T!>88.1%(b) {.SIGMA. I?2212!+.SIGMA. I?2201!}/.SIGMA. I?T!>94.8%(c) {.SIGMA. I?2212!+.SIGMA. I?Y.sub.2 O.sub.3 !} .SIGMA. I?T!>88.1%(d) {.SIGMA. I?2212!+.SIGMA. I?(Bi, Ca) O!}/.SIGMA. I?T! >88.8%where .Type: GrantFiled: April 1, 1996Date of Patent: January 26, 1999Assignees: Osaka Gas Co., Ltd., International Superconductivity Technology Center, Mitsubishi Denki KKInventors: Shuzo Kudo, Hisao Ohnishi, Masamichi Ipponmatsu, Shoji Tanaka, Hisao Yamauchi, Satoshi Takano, Mitsunobu Wakata
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Patent number: 5810984Abstract: A nitrogen oxide sensor and a method of manufacturing the sensor are disclosed. The sensor has a gas detecting portion including sensitive material having electric property thereof subject to change in association with presence of nitrogen oxide in gas and a pair of electrodes electrically connected with the gas detecting portion. The gas detecting portion includes, as a main component thereof, metal oxide compound represented by a general formula:Bi.sub.2 Sr.sub.2 (Ca.sub.1-x Y.sub.x)Cu.sub.2 O.sub.8+y(0.8.ltoreq.x.ltoreq.1; 0.ltoreq.y.ltoreq.1)and having the 2212 phase crystal structure and crystalline size greater than 100 .ANG..Type: GrantFiled: April 22, 1997Date of Patent: September 22, 1998Assignee: Osaka Gas Co., Ltd.Inventors: Shuzo Kudo, Hisao Ohnishi, Hisashi Sakai