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| Number | Title | Issue Date |
| 8177958 | Electro-chemical sensor An electro-chemical sensor is described having one or more redox species sensitive to a certain analyte and one or more redox species that are insensitive to that analyte, for the purpose of making measurements in a downhole environment in aquifers or oilfield reser... | 05/15/2012 |
| 7972495 | System, method, and probe for monitoring pH levels of a sample medium A system for monitoring a pH level of a sample medium is disclosed herein as including a pH probe having a pH-sensitive electrode, a reference electrode and a temperature electrode arranged within a housing of the pH probe. The probe housing generally includes a fle... | 07/05/2011 |
| 7820029 | pH measurement system and method for reducing time-drift effects thereof A system of measuring pH of a solution having a calibration device to counteract time-drift effect. The calibration device of the system adjusts a compensation voltage to zero a measuring voltage of a first sensor and only respond to time-drift voltage of the first ... | 10/26/2010 |
| 7429371 | Reversible oxidation of carbon nanotubes Carbon nanotubes have been reversibly and readily oxidized and reduced with common chemicals in solution, thereby allowing the nanotubes to be used as catalysts for chemical reactions and as stable charge storage devices. ... | 09/30/2008 |
| 7349760 | System and method for sensing and controlling the concentration of a chemical agent in a solution A system for measuring and controlling the concentration of a chemical agent in a solution has a reaction cell for receiving a sample, a titrant dropper for releasing one or more drops of titrant into the sample, a first photosensor for sensing disruptions of light ... | 03/25/2008 |
| 7318273 | Method for producing pH probes A method for producing a pH measuring probe includes: providing an electrode wire protruding out of both sides of a recording device, the electrode wire being fixed to the recording device with the first end thereof, placing a glass tube over a second end of the ele... | 01/15/2008 |
| 7314541 | Ion measuring composite electrode The present invention provides an improved ion measuring composite electrode, measuring instrument incorporating the composite electrode, and a manufacturing method for forming a preform of a composite double glass pipe for forming the ion measuring composite electr... | 01/01/2008 |
| 7276145 | PH electrode An object of the present invention is to suppress an electric potential drift as described above and improve pH measurement precision in order to obtain practical measurement precision in the dry-type multilayered film-type pH electrode. The present invention provid... | 10/02/2007 |
| 7270736 | Electrode system for electrochemical sensor The system concerns an electrode system for an electrochemical sensor, comprising, arranged on a conductive substrate (10), a plurality of micro-discs (22) electrically connected to the substrate and a generating electrode (20) insulated from th... | 09/18/2007 |
| 7238267 | Self-condensing pH sensor The present invention pertains to an apparatus and a means of constructing a pH sensor that can detect changes in pH levels of humidified gases and liquid samples. When electronically connected to a computerized or analog display means, sensitive quantitative measur... | 07/03/2007 |
| 7182847 | System and probe for monitoring pH levels of a sample medium A system for monitoring a pH level of a sample medium is disclosed herein as including a pH probe having a pH-sensitive electrode, a reference electrode and a temperature electrode arranged within a housing of the pH probe. The probe housing generally includes a fle... | 02/27/2007 |
| 7166201 | Self-condensing pH sensor The present invention pertains to an apparatus and a means of constructing a pH sensor that can detect changes in pH levels of humidified gases and liquid samples. When electronically connected to a computerized or analog display means, sensitive quantitative measur... | 01/23/2007 |
| 7108774 | Method for analyzing a papermaking process and an electrochemical sensor for analyzing liquid A method for analyzing a papermaking process is disclosed in which several electrochemical quantities are measured from at least one liquid flow and fingerprints according to good process situations are determined. The electrochemical measurements are carried out in... | 09/19/2006 |
| 7041209 | pH-sensitive amperometric biosensor The present invention describes a new electrochemical biosensor comprising (i) a biocatalyst producing a pH change when interacting with the analyte to be determined and (ii) a compound exhibiting different redox properties both in its protonated and non-protonated ... | 05/09/2006 |
| 6884332 | Method and apparatus for treating an aqueous electroplating bath solution A method and apparatus for treating an aqueous electroplating bath solution. The method comprises continuously agitating the solution; adjusting the pH of the solution, adjusting the temperature of the solution while adding an amount of hydrogen peroxide sufficient ... | 04/26/2005 |
| 6860984 | pH electrode and methods of preparing and using same A pH electrode having a pH-sensitive region on an electrically conductive support, said pH-sensitive region comprising a mixture of between 50% and 85% of the total mixture by weight of particles of a Group VA or G... | 03/01/2005 |
| 6841292 | Hydrogen sensor for fuel processors of a fuel cell A method and apparatus estimate hydrogen concentration in a reformate stream produced by a fuel processor of a fuel cell. A sensor measures carbon monoxide, carbon dioxide, and water in the reformate stream. A fuel meter controls fuel input to the fuel processor. An... | 01/11/2005 |
| 6663756 | Microchip-type oxygen gas sensor based on differential potentiometry Disclosed is a microchip-based differential-type potentiometric oxygen gas sensor, which comprises a working electrode and a reference electrode. The working electrode is composed of a cobalt-plated electrode, a buffered hydrogel, and an ion sensitive gas... | 12/16/2003 |
| 6653842 | Galvanic probes as pH and oxidation reduction potential sensors, control devices employing such probes, and related methods A galvanic probe comprises a sensor electrode and a reference electrode. The sensor electrode has an exposed surface that comprises a noble metal or antimony or bismuth, and, optionally, an oxide or hydroxide thereof. The reference electrode is spaced apa... | 11/25/2003 |
| 6579440 | Replaceable reference junction including an ion-barrier for an electrochemical sensor A reference junction for a reference half-cell, the reference junction including an ion-barrier membrane and being sized and shaped for removable receipt within a receptacle of a reference half-cell housing. The reference junction may be included in an el... | 06/17/2003 |
| 6572748 | Reference electrode A reference electrode (1) for electrochemical measurements includes a metallic palladium-containing electrode component (3) which is covered by a layer (4) formed of or containing a palladium compound poorly soluble in aqueous media. Positioned on layer (... | 06/03/2003 |
| 6475438 | Field test apparatus for analysis of coolants and heat-exchange fluids A test method and apparatus for determining the content of carboxylic acid-based corrosion inhibitors in a coolant or heat exchange fluid. The amount of acidic reagent added to the coolant or fluid between two pH equilibrium points is measured to determin... | 11/05/2002 |
| 6464940 | pH sensor and pH measurement method employing the same A pH sensor is provided capable of readily determining the pH of a solution of a small amount. The pH sensor includes a semiconductor substrate, an oxide film provided on the semiconductor substrate, a solution storage part for holding a solution on the o... | 10/15/2002 |
| 6416653 | Device for separating electrolyte chambers within an electrochemical sensor The present invention is drawn generally to an improved electrochemical sensor. The reference cell within the sensor can be a salt bridge comprising at least two chambers for containing an electrolyte fluid, preferably containing a semipermeable plug impr... | 07/09/2002 |
| 6416646 | Method of making a material for establishing solid state contact for ion selective electrodes A polymeric material which to form a stable, reproducible interface between the ionic and electronic domains of an ion selective sensor, or an ion selective field effect transistor, or the like is provided. When employed in an ion selective sensor, the po... | 07/09/2002 |
| 6395158 | PH sensor with electrical noise immunity A sensor for measuring pH of a solution includes a housing with an exterior surface for exposure to the solution. A measuring glass electrode within a tubular circuit ground electrode extends through the exterior surface. A reference glass electrode is re... | 05/28/2002 |
| 6355158 | Method of measuring pH The present invention provides a means to substantially decrease the pH bias that is commonly observed with pH data obtained using ion selective electrode (ISE) containing instruments that have a solvent polymeric membrane based ISE pH electrode. The pH b... | 03/12/2002 |
| 6306284 | Apparatus and method for monitoring fluorine ions An apparatus and a method for determining concentration of fluorine ions in aqueous solutions are provided. In the apparatus, a pH sensor is provided for sensing a pH value of an aqueous solution to be determined. A pH controller is then used to compare t... | 10/23/2001 |
| 6299754 | PH sensitive reference electrode in electrolytic desilvering An apparatus is disclosed for electrolytic desilvering of photographic processing solutions, more particularly fixing solutions or bleach-fixing solutions, comprising an electrolysis unit equiped with a monitoring system comprising a cathode, an anode and... | 10/09/2001 |
| 6235491 | Assay utilizing magnetic particles An assay for the presence of an analyte or determining a biological or medical parameter comprising the steps of adding an assay component to a pH-sensitive material charged with magnetic particles, wherein the assay component causes a pH change which is ... | 05/22/2001 |
| 6214206 | Use of a chemical sensor A chemical sensor (1) for selectively detecting an analyte in a solution as described. The sensor comprises a flow-through chamber (2), a selective membrane (3), a transducer means (4), an inlet (5) for a liquid flow containing a recognition element, and ... | 04/10/2001 |
| 6193865 | Analytic cell Electrochemical cell having a porous substrate and a first and a second electrodes separated by an ion diffusion inhibiting partition is disclosed. The ion diffusion inhibiting partition between the two electrodes is defined by compressing the substrate a... | 02/27/2001 |
| 6168707 | Ion measurement apparatus and methods for improving the accuracy thereof The accuracy and temperature-independence of ion-selective electrode meters having a logarithm resistance temperature correction incorporated therein is enhanced by using a microprocessor controlled and measured circuit with switched reference and switche... | 01/02/2001 |
| 6146514 | Apparatus and method for measuring acidity An acidity measuring apparatus includes a measuring container for accommodating an electrolyte solution including one of a 1,2-benzoquinone derivative and a 1,4-benzoquinone derivative, an organic solvent, an electrolyte and an acid-containing subject for... | 11/14/2000 |
| 6139707 | pH electrode arrangement A pH electrode arrangement comprises an inner wire electrode of silver sulfide, and a fill solution comprising a solution of sodium thiosulphate, a buffer, and an antioxidant. The arrangement has a fast response to a change in temperature, a half cell nea... | 10/31/2000 |
| 6123827 | Method for calibrating sensors used in diagnostic testing A method is disclosed for reliably calibrating a sensor used in diagnostic sensing of a predetermined parameter, e.g., CO2 partial pressure, O2 partial pressure, or pH, of a solution such as blood, the method compensating for expecte... | 09/26/2000 |
| 6066249 | Method for calibrating an instrument for measuring electrolytes and metabolites by analysis of blood gases A method for calibrating an instrument for the analysis of blood gases which possesses ion-sensitive electrodes and gas-sensitive electrodes and is used for the determination, in a biological fluid, of the concentration of electrolytes and metabolites in ... | 05/23/2000 |
| 6022463 | Sensors with subminiature through holes The present invention is a sensor having an electrode formed in electrical contact with a subminiature through hole. Because of the small diameter of the through hole, the material that fills the through hole and the through hole itself have an essentiall... | 02/08/2000 |
| 5993640 | Method of measuring the CaCO3 content of a scrubbing suspension, especially for a flue gas desulfurizing absorber The CaCO3 content of a scrubbing suspension, especially for a desulfurizing apparatus for flue gas is measured by injecting an acid into a constant mass flow of the suspension circulating along a bypass and measuring the pH before and after suc... | 11/30/1999 |
| 5945830 | Flow through fluid pH and conductivity sensor A sensor for measuring pH and conductivity for liquids is disclosed. The sensor includes a housing having a pH cell and a conductivity cell. A pH fluid flow path is defined between a pH cell fluid inlet and pH cell fluid outlet. An aperture within the pH ... | 08/31/1999 |
