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| Number | Title | Issue Date |
| 7311757 | Analyte pre-concentrator for gas chromatography An analyte pre-concentrator for gas chromatography is disclosed generally comprising a tube having a restricted outlet and packed with an adsorbent, wherein the tube serves as the liner of a chromatographic injector, as an adsorbent trap coupled to a chromatographic... | 12/25/2007 |
| 7189574 | Measurement of nitrogen content in a gas mixture by transforming the nitrogen into a substance detectable with nondispersive infrared detection 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. ... | 03/13/2007 |
| 6974495 | Analyte pre-concentrator for gas chromatography An analyte pre-concentrator for gas chromatography is disclosed generally comprising a tube having a restricted outlet and packed with an adsorbent, wherein the tube serves as the liner of a chromatographic injector, as an adsorbent trap coupled to a chromatographic... | 12/13/2005 |
| 6947126 | Dilution apparatus and method of diluting a liquid sample A dilution apparatus for continuously producing a diluted liquid sample, e.g., a chemical-mechanical polishing slurry, for analysis, e.g., particle size distribution, comprises a mixer manifold, a diluent-introducing means, e.g., a flow controlling device, for intro... | 09/20/2005 |
| 6653143 | Process and device of elemental analysis Elemental analysis of a sample is carried out in an oxygen atmosphere in a combustion reactor and the volume of oxygen required for analysis is determined by means of the algorithm... | 11/25/2003 |
| 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 |
| 6455317 | Method of controlling a chemical process by microwave radiation A system and method for controlling a microwave heated chemical process is disclosed. Time varying concentrations of some chemical substances within fumes in the microwave oven are monitored to detect concentration variations for which responses are known... | 09/24/2002 |
| 6368870 | Controlled diffusion analysis A method is described for determining the presence of a volatile component in a test sample. The method involves use of two separate vessels, one of which is capable of being placed wholly within the other vessel. The test sample is placed in the larger v... | 04/09/2002 |
| 6287868 | Process for determination of nitrogen A process is claimed for the determination of nitrogen content in a nitrogen containing material, said process comprising: a) at least one pre-treatment step, b) at least one distillation step and c) at least one determination step; wherein said distillat... | 09/11/2001 |
| 6143568 | Method for determining constituents in water A method for determining constituents in water, in particular the content of organic carbon and/or nitrogen, in which an aqueous sample is evaporated and combusted in at least one heating vessel (154a) provided with a heater (154), and the combustion prod... | 11/07/2000 |
| 6033912 | Method of controlling a chemical process heated by microwave radiation A system and method for controlling a microwave heated chemical process is disclosed. Time varying concentrations of some chemical substances within fumes in the microwave oven are monitored to detect concentration variations for which responses are known... | 03/07/2000 |
| 5972711 | Microwave assisted chemical processes A method for microwave assisted chemical processes is disclosed that comprises applying sufficient microwave radiation to a temperature-monitored mixture of reagents, with at least one of the reagents being thermally responsive to electromagnetic radiatio... | 10/26/1999 |
| 5968835 | Method for estimating nitric acid and nitrous acid ions To estimate nitric acid ions and nitrous acid ions in a sample solution, a method is proposed which comprises the steps of (a) feeding both the sample solution and a reducing agent to an acidic solution which is flowing in a thin pipe; (b) positively mixi... | 10/19/1999 |
| 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 |
| 5840583 | Microwave assisted chemical processes A method for microwave assisted chemical processes is disclosed that comprises applying sufficient microwave radiation to a temperature-monitored mixture of reagents, with at least one of the reagents being thermally responsive to electromagnetic radiatio... | 11/24/1998 |
| 5731209 | Method for the determination of nitrogen concentration in compound semiconductor An efficient method is proposed for the determination of the concentration of nitrogen in an indirect-transition compound semiconductor such as gallium phosphide added as an isoelectronic trap. The method utilizes the fact that a good correlation of propo... | 03/24/1998 |
| 5698083 | Chemiresistor urea sensor A sensor to detect and quantify urea in fluids resulting from hemodialysis procedures, and in blood and other body fluids. The sensor is based upon a chemiresistor, which consists of an interdigitated array of metal fingers between which a resistance meas... | 12/16/1997 |
| 5668014 | Device and method for estimating three nitrogen-including ionic substances in water To estimate nitric acid ions and nitrous acid ions in a sample solution, a method is proposed which comprises the steps of (a) feeding both the sample solution and a reducing agent to an acidic solution which is flowing in a thin pipe; (b) positively mixi... | 09/16/1997 |
| 5612225 | Process and apparatus for determining total nitrogen content by elemental analysis This invention provides a process for determining the nitrogen content of a sample involving (a) combusting the sample in a combustion reactor in the presence of oxygen, which oxygen is introduced into the combustion reactor in pulse form; (b) reducing th... | 03/18/1997 |
| 5567621 | Method of and apparatus for analyzing nitrogen compound and phosphorus compound contained in water Sample water is supplied to an oxidative decomposer, heated to 90° C. under presence of a photooxidation catalyst, and irradiated with ultraviolet radiation by a low pressure mercury lamp while being supplied with air, to cause photooxidative decompositi... | 10/22/1996 |
| 5459076 | Method for detecting nitric oxide, nitrosonium equivalents, S-nitrosothiols and S-nitroso-proteins in biological systems Nitric oxide, nitrosonium, S-nitrosothiols, and S-nitroso-proteins can be detected in biological samples, using a method which involves injection of samples into a photolysis cell, prior to detection of chemiluminescence generated by the reaction between ... | 10/17/1995 |
| 5459075 | Apparatus for measuring the total content of organic carbon and nitrogen in water An apparatus for measuring the total content of organic carbon (TOC) and nitrogen (TN) in water. The TOC value is correctly determined as the sum of the liquid, dissolved, and solid substances of a specimen of the water. The apparatus includes a NDIR gas ... | 10/17/1995 |
| 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 |
| 5340542 | Apparatus for the measurement of the total content of organic carbon and nitrogen in water The invention relates to a method for measuring of the total content of organic carbon and of nitrogen in water. The total organic carbon value is obtained correctly as the sum of the liquid, dissolved, and solid materials of a sample of the water. The de... | 08/23/1994 |
| 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 |
| 5292666 | Method for the measurement of the total content of organic carbon and nitrogen in water A method for measuring of the total content of organic carbon and of nitrogen in water. The total organic carbon value is obtained correctly as the sum of the liquid, dissolved, and solid materials of a sample of the water. The device comprises a non-disp... | 03/08/1994 |
| 5260219 | Method of determining nitrogen balance and fat loss for persons involved in diet and/or physical training program A test kit for determining the relative level of nitrogen of a user who is involved in a health program where diet and exercise are monitored and adjusted for optimizing physical development, the system includes a plastic stick having a first reagent zone... | 11/09/1993 |
| 5185268 | Method for the determination of total nitrogen including adding an alkali metal halide or an alkaline earth metal halide to the sample A method of determining nitrogen in various nitrogenous materials, wherein the materials are combusted by being brought into contact with a solid metallic catalytic mass, in the presence of an oxygenated gas, so as to convert the nitrogen into NO. This is... | 02/09/1993 |
| 5061638 | Nitrate analyzer A system and method for determining the concentration of nitrate ions in a nitrate ion-containing water sample which also contains chloride ions and bicarbonate ions is disclosed. The potentially interfacing chloride ions are suppressed by reaction with a... | 10/29/1991 |
| 4983360 | Gallium nitride and oxynitrides used as selective detectors of reducing gases, process of making and device containing them The present invention relates, a compound for use with selective detectors of the semiconductor resistance type which detect for nitrogenous reducing gases in the atmosphere, especially ammonia and gases containing NH and/or NH2 groups, said co... | 01/08/1991 |
| 4828800 | System for trace gas detection A system for the detection of trace components in a gas by a process involving the ionization of such trace components and intermittently adding to the gas, a reactant gas which converts some of the components to more readily ionizable forms.... | 05/09/1989 |
| 4778764 | Detection system and method A detection system for detecting the presence of predetermined compounds in a sample. The system comprises a sample injection means, a chromatographic column, a conversion means and one or more specific gas detectors. The conversion means transforms the c... | 10/18/1988 |
| 4645746 | Digestion process An improved process for quantitatively determining nitrogen content or other elemental content in a wide variety of materials. The process avoids the use of conventional catalysts, is simpler and faster than previous techniques, and results in a very high... | 02/24/1987 |
| 4645745 | Digestion process An improved process for quantitatively determining nitrogen content in a wide variety of materials. The process avoids the use of conventional catalysts, is simpler and faster than previous techniques, and results in a very high degree of accuracy. The pr... | 02/24/1987 |
| 4526755 | Gas analyzer or the like An analyzer for natural gas to determine the existence of and concentration of wanted and unwanted sulfur compounds and odorizing agents.... | 07/02/1985 |
| 4517216 | Gellan gum/gelatin blends Blends of gellan gum and gelatin are disclosed which exhibit a synergistic increase in gel strength.... | 05/14/1985 |
| 4333735 | Process and apparatus for measuring gaseous fixed nitrogen species Process and apparatus for measuring total fixed gaseous nitrogen species, including NH3, NO, NO2, HCN and organic amines in gaseous mixtures. The process involves catalytic conversion at elevated temperature of all fixed nitrogen spe... | 06/08/1982 |
| 4332591 | Analytical method and apparatus for the determination of total nitrogen contents in aqueous systems An analytical method for the determination of the total nitrogen content in aqueous systems, which comprises passing an inert gas stream containing substantially no nitrogen and carbon dioxide through a reaction tube, which is packed with a decomposition ... | 06/01/1982 |
| 4285699 | Analytical method and apparatus for the determination of total nitrogen contents in samples An analytical method for the determination of total nitrogen contents in samples, which comprises passing an inert gas stream containing substantially no nitrogen through a first reaction tube which is packed with a decomposition catalyst and oxidizing ag... | 08/25/1981 |
| 4229180 | Process and catalyst for determining nitrogen in a sample according to the Kjeldahl principle An antimonate, such as potassium antimonate, is used as the destruction catalyst in nitrogen determinations according to the Kjeldahl principle. Preferred catalyst comprises potassium antimonate together with potassium sulfate (for increasing the boiling ... | 10/21/1980 |
