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| Number | Title | Issue Date |
| 8123921 | Method and device for the preparation of liquid samples in NMR spectroscopy using a combined titration and pH electrode A method and device have an electrode rod (1; 21) for a pH meter. The electrode rod (1; 21) has a measuring end (2; 22) for immersion into a liquid test sample (31), wherein the measuring end (2; 22) has a pH measuring element, and... | 02/28/2012 |
| 7438796 | Electrochemical chlorine sensor A sensor for measurement of free chlorine and of total chlorine in aqueous solution including a working electrode having a self-assembled monolayer (SAM) formed on the surface thereof, producing a barrier which reduces the generation of background currents when elec... | 10/21/2008 |
| 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 |
| 7247485 | Karl Fischer reagent Karl Fischer reagent comprising iodide, sulphur dioxide with an initial concentration above 0.5 M, and imidazole/imidazole derivative dissolved in alcoholic solvent, whereby the molar ratio between the initial imidazole/imidazole derivative concentration and the ini... | 07/24/2007 |
| 7182853 | Redox control/monitoring platform for high throughput screening/drug discovery applications The invention is a redox control and monitoring platform that is to be used in conduction with another detection scheme. The platform includes a portion of an electrochemical control. The electrochemical control can be operated to control and measure the redox envir... | 02/27/2007 |
| 7022219 | Automated system for continuously and automatically calibrating electrochemical sensors An electrochemical sensor system that continuously monitors and calibrates the sensors included in the system. The invention also includes a method for determining failure patterns of a sensor and incorporating into an electrochemical sensor system the ability to re... | 04/04/2006 |
| 6951765 | Method and apparatus for introduction of solid precursors and reactants into a supercritical fluid reactor The present invention pertains to apparatus and methods for introduction of solid precursors and reactants into a supercritical fluid reactor. Solids are dissolved in supercritical fluid solvents in generator apparatus separate from the supercritical fluid reactor. ... | 10/04/2005 |
| 6936156 | Automated self-calibrating water quality monitoring sensor housing assembly An automated self-calibrating water quality monitoring sensor housing assembly includes a number of ion-selective electrodes combined in a single flow train to provide for the multi constituent analysis of a number of samples without direct intervention by a human o... | 08/30/2005 |
| 6913686 | Methods for analyzing solder plating solutions The present invention relates to methods and apparatus for determining concentrations of various inorganic or organic components in solder plating solutions, which include titration or parallel titration methods, direct potentiometry methods, calibration methods, an... | 07/05/2005 |
| 6890715 | Sensors of conducting and insulating composites The present invention provides a class of sensors prepared from at least a first material having a positive temperature coefficient of resistance and a second non-conductive or insulating material compositionally different than the first material that show an increa... | 05/10/2005 |
| 6361670 | Device for coulometric determination of water by the Karl Fischer method A device for the coulometric determination of water by a Karl Fischer reaction comprising a membrane-free measuring cell that contains a liquid reagent, an iodine indicating means, an anode, a cathode and a casing around the cathode to define a cathode sp... | 03/26/2002 |
| 6315954 | Acid or base generator and analyzer An apparatus for generating high purity acid or base in an aqueous stream for use in analysis. For generating a base, the aqueous stream is directed through a cation exchange bed having first strongly acidic and second weakly acidic portions. An electrica... | 11/13/2001 |
| 6316271 | Acid or base generator and method of use A method for generating high purity acid or base in an aqueous stream for use in analysis. For generating a base for anion chromatography, the aqueous stream is directed through a cation exchange bed having strongly acid first and weakly acidic second por... | 11/13/2001 |
| 6315888 | Method of constant-current polarization voltage and apparatus for Karl-Fischer technique A constant-current polarization voltage detecting method includes step of feeding to a detecting electrode a predetermined minute current in a pulse form, and detecting sequentially a polarization voltage at each time of feeding the pulsating current, in ... | 11/13/2001 |
| 5961801 | DNA separation electrophoresis gels and methods for their use A novel electrophoresis separation medium comprises polyacrylamide and a dioxane. An electrophoresis separation system comprises a separation channel, the separation channel including the novel separation medium. In a method for electrophoretically separa... | 10/05/1999 |
| 5891322 | Electroanalysis process using potentiometry with coulometric stripping (elution) Electroanalysis of an electroactive, and especially ionized, species, in trace form, in a liquid sample, is by potentiometry with coulometric stripping (elution), and is by employing a working electrode in electrical contact with the sample. A practically... | 04/06/1999 |
| 5738772 | In-line/on demand reaction delivery system and method An on-line method for the continuous generation of alkali metal salts includes continuously reacting a source of acidity, a liquid having a low pH value, with a source of alkalinity, a liquid having a high pH value, while continuously monitoring an electr... | 04/14/1998 |
| 5597463 | Device for electrochemical measurements A titration electrode device for measuring the amount of a species in solution in a test liquid comprises a counter electrode and a generator electrode both in a chamber for receiving a thin layer of test liquid, the two electrodes being located in respec... | 01/28/1997 |
| 5567618 | Karl Fischer reagent The present invention relates to a Karl Fischer reagent for the determination of water, characterized in that it contains tetrahydrofurfuryl alcohol (THFA) as alcohol component.... | 10/22/1996 |
| 5466606 | Use of N-methylformamide as solvent for the Karl Fischer titration The invention relates to the use of N-methylformamide as solvent in the determination of water by the Karl Fischer method.... | 11/14/1995 |
| 5312528 | Method of determining, with the aid of an ion-selective electrode, the concentration of a substance to be determined, and apparatus to be used in said method The invention relates to a method of determining an ion concentration with the aid of an ion-selective electrode, in which method a known quantity by volume of a sample is taken, a buffer is added and the initial potential of the electrode pair is measure... | 05/17/1994 |
| 5300207 | High current coulometric KF titrator A high current coulometric titrator for the Karl Fischer determination of water in which a diaphragm is not required between the electrodes of the iodine-generating circuit. These electrodes are designed to ensure that substantially only iodine is generat... | 04/05/1994 |
| 5296193 | Combined titration apparatus A titration apparatus, which operated volumetrically and/or coulometrically, includes a basic apparatus with a control and actuation arrangement for the volumetric metering of reagents, a metering unit for the volumetric titration removably attached to th... | 03/22/1994 |
| 5292413 | Catholyte for the Karl Fischer coulometric water determination The present invention relates to a catholyte for the Karl Fischer coulometric water determination, which is characterized in that it is composed of a solution of one or more salts of an organic nitrogen base and acid in a solvent.... | 03/08/1994 |
| 5286358 | Method of analyzing the complexing power of a pickling liquor A method is provided for accurately determining the complexing capacity (or free HF concentration) of a pickling liquor. A sample of pickling liquor is obtained and an excess of ferric ion is added thereto to complex with all of the free HF in the sample.... | 02/15/1994 |
| 5230785 | Method and apparatus for analysis of swimming pool water and analytical cell utilized therein A swimming pool water analyzer has a housing providing a coulometric titration chamber, a chlorine concentration measuring chamber, a chamber for measuring pH, and conduits connecting the several chambers, the reservoir and a discharge outlet. One or more... | 07/27/1993 |
| 5209832 | Process for the preparation of metal complex dyes The invention relates to a process for the preparation of a metal complex dye under production conditions, which comprises reacting at least one dye with a metal donor, adding said metal donor or said dye discontinuously before the end point of the metall... | 05/11/1993 |
| 5196096 | Method for analyzing the addition agents in solutions for electroplating of PbSn alloys A method for measuring concentrations of addition agents in solutions of additive mixtures, namely for monitoring additives in PbSn plating solutions, comprising the steps of: (a) preparing a basis solution which contains an electroactive species whose el... | 03/23/1993 |
| 5186895 | Method and apparatus for automatic analysis of fluid composition involving a time-dependent variation thereof An automatic analytical apparatus in which a series of operations ranging from the sampling into a treating receptacle, pretreatment, analysis and discharge of a fluid sample to the preparation for the next analysis are repeated automatically in order, wh... | 02/16/1993 |
| 5041202 | Apparatus for the continuous production of a standard ionic solution This apparatus essentially comprises a coulometric cell (10) having an electrically insulating tight enclosure (12, 14, 30) containing a cathode (20) and an anode (22) which face one another and defining between them a space (21) for the passage of the so... | 08/20/1991 |
| 5015957 | Amperometric method for measuring acidity An amperometric method for the direct measurement of acidity in a medium which contains at least one ester of an acid containing oxygen, and whose dielectric constant is lower than 30. The method provides for maintaining a constant voltage between an ultr... | 05/14/1991 |
| 4948473 | Surfactant sensing electrode for potentiometric titrations A coated-wire electrode for potentiometrically titrating surfactant molecules having more than ten carbon atoms includes an electrically-conductive core coated with a semipermeable membrane. The membrane matrix included a polymer, a plasticizer and an ion... | 08/14/1990 |
| 4929314 | Coulometric titrator apparatus and method A high pressure coulometric titration apparatus features a pressure vessel for containing a titration vessel, which is capable of being subjected to a pressure above the vaporization pressure of the sample to be analyzed. A back pressure regulator is empl... | 05/29/1990 |
| 4897128 | Process of determining the zinc content of phosphating baths Described is a process for determining the zinc content of an acid aqueous phosphating bath. A bath sample is titrated at a pH value between 1.2 and 1.7 in the presence of ethylenediaminetetraacetic acid, hexamethylenetetramine and alkalihexacyanoferrate ... | 01/30/1990 |
| 4886590 | Chemical process control system A chemical process control system includes a plurality of sensors for sensing various parameters of several baths employed in a chemical process. A microprocessor is employed to interrogate each sensor, to determine bath characteristics from one or more o... | 12/12/1989 |
| 4839000 | Buffer compensation in enzyme-modified ion sensitive devices A system suitable for determining the concentration of an enzyme's substrate in a solution 21 containing a buffer comprises two ion-sensitive devices 22, 23, such as ISFETS, in contact with the solution, one of the devices 23, e.g. an ENFET, having a laye... | 06/13/1989 |
| 4810331 | Surfactant sensing electrode for potentiometric titrations A coated-wire electrode for potentiometrically titrating surfactant molecules having more than ten carbon atoms includes an electrically-conductive core coated with a semipermeable membrane. The membrane matrix includes a polymer a plasticizer and an ion-... | 03/07/1989 |
| 4802957 | Method for measuring the water content of a solid sample using Karl Fischer's coulometric titration An electrolytic solution for Karl Fischer's coulometric titation and a method for measuring the water content of a sample using the same are disclosed. The electrolytic solution contains iodine or an iodide, sulfur dioxide, an amine and a solvent, wherein... | 02/07/1989 |
| 4798803 | Method for titration flow injection analysis A method for titration flow injection analysis by introducing a multicomponent sample into a carrier stream which flows into a mixing/sensing cell and titrating with a reactant more than one component of the sample by sensing a plurality of endpoints. The... | 01/17/1989 |
| 4778570 | Process for determining the organic halogen content of organic samples The invention relates to an analytical method for determining the organic halogen content of a sample. The results of the present method are superior to known methods, and are independent of the physico-chemical properties of the halo-organic compounds in... | 10/18/1988 |
