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| Number | Title | Issue Date |
| 7323343 | Nitrogen monoxide, nitrogen dioxide and ozone determination in air 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 monox... | 01/29/2008 |
| 7297549 | Method of determining measurement bias in an emissions monitoring system 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 c... | 11/20/2007 |
| 7239766 | Optical sensing elements for nitrogen dioxide (NO) gas detection, a sol-gel method for making the sensing elements and fiber optic sensors incorporating nitrogen dioxide gas optical sensing elements A sensing element, a method of making a sensing element, and a fiber optic sensor incorporating the sensing element are described. The sensor can be used for the quantitative detection of NO2 in a mixture of gases. The sensing element can be made by incor... | 07/03/2007 |
| 7185601 | Chemically sensitive warning apparatus and method A chemically sensitive warning apparatus capable of changing colors upon contact with a chemical is disclosed. The apparatus preferably comprises an elongated tape having opposed, first and second major surfaces and warning indicia visible to an individual viewing t... | 03/06/2007 |
| 7029920 | Method and system for monitoring combustion source emissions 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 ... | 04/18/2006 |
| 6946300 | Multi-modal detection of explosives, narcotics, and other chemical substances 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 to cause selective desorption of molecules of the contraband... | 09/20/2005 |
| 6878339 | NOx-concentration measuring apparatus 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 fo... | 04/12/2005 |
| 6867047 | Method and apparatus for preventing nitrogen interference in pyro-electrochemical methods 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... | 03/15/2005 |
| 6780378 | Method for measuring concentrations of gases and vapors using controlled flames 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 ... | 08/24/2004 |
| 6635415 | Nitric oxide gas detector 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 di... | 10/21/2003 |
| 6623699 | Analyzing system for high accuracy nitrogen determination 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 ana... | 09/23/2003 |
| 6593095 | Detection of GPI anchored proteins 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... | 07/15/2003 |
| 6362005 | Nitrogen dioxide gas sensing method, nitrogen dioxide gas sensor element, and nitrogen dioxide gas sensor using the same 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 ... | 03/26/2002 |
| 6346419 | Photolysis system for fast-response NO2 measurements and method therefor 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 c... | 02/12/2002 |
| 6100096 | Nitric oxide detector 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 chemilumines... | 08/08/2000 |
| 5976889 | Gas analyzer and method for detecting NOx A method and apparatus for detecting NOx by chemiluminescence. The apparatus includes a sample gas line having an inlet port for receiving a sample gas, a NOx converter connected to the sample gas line, a N2 diluting gas l... | 11/02/1999 |
| 5976888 | Method for measuring NOx in biochemical processes A method for measuring NOx 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 ... | 11/02/1999 |
| 5906946 | Device and process for detecting and discriminating NO and NO2 from other nitrocompounds in real-time and in situ 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 am... | 05/25/1999 |
| 5891735 | Method for measuring nitric oxide in nitrosyl (FeII)-hemoglobin and S-nitrosohemoglobin 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 ... | 04/06/1999 |
| 5866075 | Device useful for sensing ammonia and nitrogen oxides(s) gases at room temperature A device for sensing ammonia (NH3) and nitrogen oxide (NOx) 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 detecti... | 02/02/1999 |
| 5863503 | Nitrogen oxide detecting sensor and method of manufacturing the same 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 str... | 01/26/1999 |
| 5810984 | Nitrogen oxide sensor and method of manufacturing the sensor 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 an... | 09/22/1998 |
| 5747348 | Diode laser interrogated fiber optic hydrazine-fuel sensor A fiber optic chemical dosimeter system detects the presence of hydrazine fuels and nitrogen tetroxide and nitrogen dioxide gases that are used at rocket launch sites using colorimetric sensors that react selectively with the gases and then absorb laser l... | 05/05/1998 |
| 5739038 | Spectrometer gas analyzer system A gas analyzer system for providing a spectroscopic analysis of the sample gas. This analysis is accomplished by first introducing the sample gas into the inlet of the system and transporting it to a spectral analyzer. The sample gas is then spectrally an... | 04/14/1998 |
| 5674751 | Diode laser interrogated fiber optic hydrazine-fuel sensor system and method A fiber optic chemical dosimeter system detects the presence of hydrazine fuels and nitrogen tetroxide and nitrogen dioxide gases that are used at rocket launch sites using colorimetric sensors that react selectively with the gases and then absorb laser l... | 10/07/1997 |
| 5633170 | Method and apparatus for nitrogen oxide analysis A method and apparatus for the chemiluminescent determination of NO/NOx in a sample gas is disclosed in which the NOx portion of the gas stream is catalytically converted in a preconditioned vitreous carbon bed at a relatively low te... | 05/27/1997 |
| 5567622 | Sensor for detection of nitrogen dioxide and nitrogen tetroxide A fiber optic chemical dosimeter system detects the presence of hydrazine fuels and nitrogen tetroxide and nitrogen dioxide gases that are used at rocket launch sites using colorimetric sensors that react selectively with the gases and then absorb laser l... | 10/22/1996 |
| 5514594 | Method for measurement of no contents The present invention relates to a method and a device for the measurement of NO contents in liquids using an inert carder gas. The device consists of a micro reaction part FIG. 1 which is divided into an inert gas inlet nozzle 1, the microreaction vessel... | 05/07/1996 |
| 5358874 | Nitrogen oxide analyzer and method of measuring oxides of nitrogen An NOx analyzer capable of reducing maintenance operations for removing solid substances from the analyzer, and for obtaining an analytical value of improved reliability for sample gases flowed through the analyzer is provided. A sample gas sup... | 10/25/1994 |
| 5300441 | Method for measuring and determining nitrogen content in a sample and providing an output data of total nitrogen and selected constituent nitrogen compounds including nitrate and nitrite A method for analyzing total bound nitrogen in a sample and providing an output data of total bound nitrogen and constituent compounds (nitrate and nitrite) is disclosed. The total nitrogen bound method provides a discrete sample through a furnace in the ... | 04/05/1994 |
| 5244812 | Detection of electron acceptor gases using sulfur-selenium fulvalenes NO2 and other electron acceptor gases can be detected at 5 volume parts per million by tetrathiafulvalene TTF. The TTF may be incorporated in a polystyrene film, which changes its infra-red spectrum and conductivity upon exposure to such gases.... | 09/14/1993 |
| 5179025 | Atmospheric pressure flow reactor: gas phase chemical kinetics under tropospheric conditions without wall effects A flow reactor for simulating the interaction in the troposphere is set forth. A first reactant mixed with a carrier gas is delivered from a pump and flows through a duct having louvers therein. The louvers straighten out the flow, reduce turbulence and p... | 01/12/1993 |
| 5015590 | Method of determining nitrogen dioxide concentration in a gas sample which contains ozone The interference of ozone in the determination of nitrogen dioxide determinations by luminol chemiluminescence is eliminated by first passing the gas sample into contact with a selective reducing agent for ozone, particularly antimony trioxide.... | 05/14/1991 |
| 4914037 | Method and apparatus for analysis of a sample for nitrogen Method and apparatus are provided for analyzing a sample for nitrogen. The method combusts a nebulized sample in an oxygen-rich atmosphere and then analyzes the combustion gases for nitrogen. The apparatus employs a nebulizer operatively connected to a combust... | 04/03/1990 |
| 4717675 | Method for selective conversion of organic compounds and detecting same by gas chromotography and chemiluminescence detection In a redox reaction process, the oxidized state of organic compounds is increased through the steps of directing oxides of nitrogen together with a reducing agent selected from oxygenated compounds and aromatic compounds through a catalyst bed in the form... | 01/05/1988 |
| 4618452 | Spot test for 1,3,5-triamino-2,4,6-trinitrobenzene, TATB A simple, sensitive and specific spot test for 1,3,5-triamino-2,4,6-trinitrobenzene, TATB, is described. Upon the application of the composition of matter of the present invention to samples containing in excess of 0.1 mg of this explosive, a bright orang... | 10/21/1986 |
| 4473536 | Catalytic pollution control system for gas turbine exhaust A steam and gas turbine (STAG) plant employs a catalyst in a heat recovery steam generator to react injected ammonia with NOx from the combustor of the gas turbine to reduce atmospheric emission of NOx from the system. Rapid control ... | 09/25/1984 |
| 4473537 | Ammonia control system for NOx emission control for gas turbine exhaust A steam and gas turbine combined cycle plant STAG* employs a catalyst in a heat recovery steam generator to react injected ammonia with NOx from the combustor of the gas turbine to reduce atmospheric emission of NOx from the system. ... | 09/25/1984 |
| 4269804 | Self-contained gaseous contaminant dosimeter A personal dosimeter for measuring the average concentration of a gaseous contaminant over a given period of time is provided. The dosimeter comprises a sealed pouch having a reaction chamber, which contains a gas-collecting medium, and at least one compa... | 05/26/1981 |
| 4236307 | Method of making a nitrogen dioxide sensing element A method of making an element for sensing the presence of nitrogen dioxide gas in the environment. The element is formed by heating a film of an electrically non-conductive polyaromatic polymer to a temperature sufficiently high to pyrolyze the polymer an... | 12/02/1980 |
