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| Number | Title | Issue Date |
| 7939334 | Simultaneous analysis of chlorides and sulfides by low pressure ion exclusion chromatography A process for simultaneous assay of chlorides and sulfides by low pressure ion exclusion chromatography is provided, and in said process an analytic apparatus comprising a sampling valve, a sampling loop, an ion exclusion column and an analytic detection flow path i... | 05/10/2011 |
| 7390669 | Simultaneous and rapid determination of multiple component concentrations in a Kraft liquor process stream The present invention is a rapid method of determining the concentration of the major components in a chemical stream. The present invention is also a simple, low cost, device of determining the in-situ concentration of the major components in a chemical stream. In ... | 06/24/2008 |
| 7273561 | Method for determining the chemical dosage required to reduce sulfides in wastewater to acceptable levels An apparatus and method of determining chemical dosage required to reduce sulfides in wastewater includes providing a headspace apart from the wastewater. The temperature of the wastewater and the concentration of sulfide gas in the headspace are measured. Dissolved... | 09/25/2007 |
| 7231819 | Chemical sensor for wellbore applications There is described an analyzing device having two separation units to separate molecular species to detect molecular species in wellbore fluids with both separation units operating under forced flow conditions to provide for an active separation of subterranean well... | 06/19/2007 |
| 7214345 | Apparatus for analyzing reduced inorganic sulphur An apparatus for measuring the reduced inorganic sulfur content of a sample. The apparatus has a reaction chamber (12) and means (14) for introducing a reducing agent that can selectively convert the reduced inorganic sulfur of a sample in the reaction... | 05/08/2007 |
| 7201877 | Device and method for detecting sulfuryl fluoride A device for detecting sulfuryl fluoride, in which the gas specimen to be examined is subjected to pyrolysis with ensuing detection of a pyrolysis product, is to be improved for the sake of achieving a mobile, economical structure. To attain this object, in a prelim... | 04/10/2007 |
| 7168288 | Hydrogen sulfide generator for sensor calibration The present invention relates to the use of internally-generated hydrogen sulfide as a calibration gas for hydrogen sulfide sensors. The present invention also relates to an apparatus and methods for self-calibration of hydrogen sulfide sensors. ... | 01/30/2007 |
| 7047832 | Apparatus for measuring gas exchange A container having a port for holding a liquid medium and a reactant that interact to produce a change in gas levels within the container. A removable stopper for insertion into the port creating an airtight seal. A tube extending through the stopper into the contai... | 05/23/2006 |
| 7025138 | Method and apparatus for hydrogen sulfide monitoring The present invention relates to a method and apparatus for detection of hydrogen sulfide in downhole operations. A downhole tool is provided with a coupon adapted to react at varying degrees to exposure to concentrations of hydrogen sulfide. The downhole tool is po... | 04/11/2006 |
| 7010957 | Gas sensors with improved resistance to humidity interference Semiconductor gas-sensitive materials of the formula Cr2-xTixO3 where 0.05>x≧0.0001, and gas sensors formed therefrom. ... | 03/14/2006 |
| 6993955 | Gas sensors Semiconductor gas sensors with improved selectivity to target gases are provided by having a semiconductor gas-sensing layer and a layer thereon of microporous ceramic oxide having catalytic activity. ... | 02/07/2006 |
| 6962675 | Use of spatiotemporal response behavior in sensor arrays to detect analytes in fluids Methods, systems and sensor arrays are provided implementing techniques for detecting an analyte in a fluid. The techniques include providing a sensor array including at least a first sensor and a second sensor in an arrangement having a defined fluid flow path, exp... | 11/08/2005 |
| 6947138 | Optical sensor system and method for detection of hydrides and acid gases A gas sensor for detection of hydride and/or acid gas species, featuring a color changing material that changes color in exposure to hydride and/or acid gas species, component(s) for impinging radiation on the color changing material for reflection therefrom, and co... | 09/20/2005 |
| 6939717 | Hydrogen sulphide detection method and apparatus Described is a downhole method and apparatus for detecting hydrogen sulphide in formation fluids produced in a hydrocarbon well. The sensor system is located within or in communication with an extraction chamber used to extract hydrogen sulphide in a gaseous state f... | 09/06/2005 |
| 6767746 | Method and apparatus for analyzing acid gas loading within an amine solution Method and apparatus used to calculate the hydrogen sulfide and carbon dioxide loading of both rich and lean amine solutions used to remove acidic gas components from sour or production gases in order to produce a sweet or sales gas for transmission purposes. The am... | 07/27/2004 |
| 6709635 | Gas sensor test chip A polymeric gas sensor utilizes a variety of electrode geometries to generate varied responses to selective gases. The characteristic response to various gases of each electrode geometry permits the construction of a gas sensor having desirable and reproducible char... | 03/23/2004 |
| 6340596 | Reagent composition for measuring hydrogen sulfide and method for measuring hydrogen sulfide A reagent composition for measuring hydrogen sulfide, which comprises an aniline derivative represented by the general formula (I): ##STR1## wherein R1 and R2 independently represent a substituted or unsubstituted C2 -C | 01/22/2002 |
| 6322750 | Gas detector indicator strip providing enhanced dynamic range The present disclosure is a tape responsive to gases. One version is paper impregnated with lead acetate, a backing layer of impervious sheet material, and a top face pervious, transparent layer. The top layer retards gas exposure and expands the range of... | 11/27/2001 |
| 6319722 | Analysis of hydrogen sulfide in hydride gases The method measures hydrogen sulfide concentrations in hydride gases in a sealed vessel. The sealed vessel has a gas inlet to receive a stream of hydride gas, a gas outlet to remove the stream of hydride gas and a metal acetate substrate. The stream of hy... | 11/20/2001 |
| 6133041 | Hydrogen sulfide detection tube for alcoholic beverages A kit is provided for testing a gas produced from a sample for an absolute amount of a hydrogen sulfide. The kit includes a vessel for receiving the sample to be tested. The vessel includes one or more gas flow passages through which gas within the vessel... | 10/17/2000 |
| 6098423 | Method of preparing H2 S for an isotopic analysis A method which enables the sulphur and/or hydrogen contained in a low quantity in hydrogen sulphide to be prepared: 1) the H2 S is oxidized at a temperature and for a duration selected to obtain full oxidation of the H2 S into SO2 | 08/08/2000 |
| 6046054 | Semiconducting oxide gas sensors The selectivity of response of resistive gas sensors to specific gases or vapors is improved by the selection of specified gas-sensitive materials which are not previously known for the applications described, which include detection of hydrocarbons in th... | 04/04/2000 |
| 5981289 | Hydrogen sulfide analyzer A hydrogen sulfide analyzer that continuously samples waste water from a waste stream or reservoir and measures the concentration of purgeable H2 S present (H2 SP) This information, when combined with the volume of water present, pro... | 11/09/1999 |
| 5935519 | Apparatus for the detection of sulfur A process and apparatus are disclosed for the detection and measurement of sulfur in both organic and inorganic sulfur-containing compounds. The process includes admixing a sample including a sulfur-containing compound with oxygen, and then exposing the m... | 08/10/1999 |
| 5858307 | Hydrogen sulfide analyzer with protective barrier A field test kit for determining quantity of hydrogen sulfide in a liquid st sample. The test kit includes a test container with an opening for a liquid test sample containing hydrogen sulfide gas and a cap provided over the opening. The cap has calorimet... | 01/12/1999 |
| 5849591 | Method of determining the component of a gas in a gas sample The invention is directed to a method for determining the portion of a gaseous or vaporous component in a gas mixture utilizing a detecting substance which can enter into a chemical reaction with the component to produce a coloration of the detecting subs... | 12/15/1998 |
| 5792661 | Method of detecting leaks in sealed containers An apparatus and method for detecting a leak by mixing an amount of odorant ith the contents of a sealed container. An amount of odorant having a detectable odor is mixed with the contents of a sealed container. The sealed container with the odorant is pla... | 08/11/1998 |
| 5756631 | Siloxanes with strong hydrogen bond donating functionalities Viscous, liquid hexafluoroisopropanol-siloxane polymers having the basic structure: ##STR1## wherein R1 is a monovalent hydrocarbon radical selected from the group consisting of C1 -C6 alkyl groups; cyclohexyl groups ... | 05/26/1998 |
| 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 |
| 5667558 | Apparatus and associated method for reducing an undesired constituent of gas associated with wastewater A scrubber apparatus and controller includes an outlet gas sensor, and a processor operatively connected to the outlet gas sensor and a treatment chemical supply pump for controlling a level of treatment chemical in scrubbing solution responsive to the se... | 09/16/1997 |
| 5614417 | Sulfur chemiluminescence detection method This invention is directed to an improved total sulfur chemiluminescence detection system that uses a dual burner to generate the SO speckles for contact with ozone.... | 03/25/1997 |
| 5547876 | Combustion accelerators, processes for their production and processes for their use in elemental analysis Non-toxic combustion decomposition accelerators and processes for their production for elemental analysis. The non-toxic accelerators may be either single component or multicomponent. The single component non-toxic accelerators are glass frit, niobium pen... | 08/20/1996 |
| 5529841 | Hydrogen sulfide analyzer with protective barrier A field test kit for determining quantity of hydrogen sulfide in a liquid st sample. The test kit includes a test container with an opening for a liquid test sample containing hydrogen sulfide gas and a cap provided over the opening. The cap has colorimet... | 06/25/1996 |
| 5439800 | Offshore petroleum exploration system A system is provided for locating and delineating sea floor occurrences of petroleum seepage, achieved by apparatus for the detection of the resulting abnormal distribution of electrical potential within the affected sediments. The system uses an electric... | 08/08/1995 |
| 5385830 | Apparatus for measuring free and total sulfurous acid and method of measurement The present invention provides a method for measuring the amount of free sulfurous acid and bound sulfurous acid in a sample using a bacterium belonging to Thiobacillus thiooxidans or Thiobacillus ferrooxidans of in which the sample is treated with acid a... | 01/31/1995 |
| 5356458 | Computerized chemical injection system for hydrogen sulfide control in a waste water stream A system for continuously monitoring the hydrogen sulfide concentration present in the atmosphere above a waste water stream, such as a sewerage stream, and for controlling the amount and time of injecting a specified chemical into the waste water stream ... | 10/18/1994 |
| 5322798 | Method for carrying out surface plasmon resonance measurement and sensor for use in the method In a method for carrying out a surface plasmon resonance (SPR) measurement a beam of electromagnetic radiation is directed through a part transparent to it onto a surface of a material layer having been brought on its opposite side in contact with a test ... | 06/21/1994 |
| 5322680 | Substituted 2-thiazolyl tetrazolium salt indicators 2-Thiazolyl tetrazolium salt compounds characterized by a reflectance spectrum exhibiting an extended plateau above about 600-650 nm. Such compounds are useful as chromogenic indicators for reducing substances such as NADH. The reflectance plateau confers... | 06/21/1994 |
| 5290536 | Phenyl substituted 2-thiazolyl tetrazolium salt indicators Phenyl substituted 2-thiazolyl tetrazolium salt compounds characterized by a reflectance spectrum exhibiting an extended plateau above about 600-650 nm. Such compounds are useful as chromogenic indicators for reducing substances such as NADH. The reflecta... | 03/01/1994 |
| 5176896 | Apparatus and method for generation of control signal for Claus process optimization An apparatus and method for the generation of a control signal for the optimization of sulfur removal in a Claus process unit comprises oxidizing a portion of the tail gas stream exiting the Claus unit by contacting a portion of the tail gas with an oxyge... | 01/05/1993 |
