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| Number | Title | Issue Date |
| 8183049 | Method for detecting lead present in specimen With respect to a lead detection method that uses rhodizonic acid, it is made possible to clearly identify pink or red coloration caused by a reaction between lead and rhodizonic acid even in cases where Sn is present in a specimen. To this end, an acidic aqueous so... | 05/22/2012 |
| 8133739 | Reagent for measurement of concentration of lead, and method for measurement of concentration of lead To provide a lead concentration determination reagent which realizes accurate, high-sensitivity, and simple-manner determination of the lead ion concentration (also referred to simply as “lead concentration”) of a sample solution in the presence of calcium ions,... | 03/13/2012 |
| 8114673 | Sensor for oxidising agents This invention relates to an irreversible indicator for detecting oxidizing agents, or in particular an oxygen indicator, comprising at least one redox-sensitive dyestuff, at least one semiconductor material and at least one electron donor. This indicator is activat... | 02/14/2012 |
| 7829340 | Oral fluid assays for the detection of heavy metal exposure Methods for measuring the concentration of heavy metals such as lead in oral fluid are provided. The concentration of lead in oral fluid can be accurately correlated with the concentration of lead in the blood serum. The methods are useful for, among other things, d... | 11/09/2010 |
| 7816142 | Lead testing system A system for testing multiple samples for the presence of lead includes a plurality of vessels, a plurality of plungers, a housing for removably storing the plurality of vessels, and a retainer for holding the plurality of plungers so that each of the plungers may b... | 10/19/2010 |
| 7749765 | Quantitative detection of lead in water The present invention provides compositions and methods for extracting, isolating, and measuring lead dissolved in aqueous solutions, including water. ... | 07/06/2010 |
| 7273588 | Methods of sampling halosilanes for metal analytes Methods for determining the amount of at least one metal analyte present in a liquid or gas sample of a halosilane supply (e.g., a chlorosilane supply) are disclosed herein. A sample of a halosilane supply is contacted and reacted with an aqueous hydrofluoric acid s... | 09/25/2007 |
| 7083731 | Precious metal scavenging from a liquid medium with a functionalised polymer fiber A method for the recovery of a metal from a liquid medium containing the metal I solution or in finely divided insoluble from comprises contacting the medium with a functionalized polymer fiber capable of binding the metal and recovering the metal from the fiber. Th... | 08/01/2006 |
| 6875615 | Sensors for the determination of organometallic compounds The present invention relates to sensors for the determination of organometallic compounds comprising the following elements: a) an inorganic, organic or polymeric support, insoluble in the sample to analyze b) an indicator which reversibly reacts with... | 04/05/2005 |
| 6800485 | Chemical spot test for lead in paint and other media A one-step chemical spot test for the qualitative determination of lead in lead-based paint and other media. This test is based upon the reaction of lead with sodium rhodizonate under strong acid conditions to develop an intense purple colored complex. The acid pref... | 10/05/2004 |
| 6492180 | Non-invasive transdermal detection of analytes A method and apparatus for non-invasive extraction and/or detection of chemicals such as heavy metals, drugs such as cocaine and analytes such as blood glucose has been developed. A patch or hydrogel containing a reagent such as N-methyl pyrrole, or a sim... | 12/10/2002 |
| 6489170 | Chemical spot test for lead in paint and other media A one-step chemical spot test for the qualitative determination of lead in lead-based paint and other media. This test is based upon the reaction of lead with sodium rhodizonate under strong acid conditions to develop an intense purple colored complex. Th... | 12/03/2002 |
| 6346418 | Method for evaluation of metal impurity in lithographic materials A method for evaluating ratios of metallic impurities in lithographic materials is disclosed. The method comprises: separating said metal from said lithographic material by microwave heating; then adding said metal to an acid to form a solution; and final... | 02/12/2002 |
| 6323036 | Reagents and methods for releasing and measuring lead ions from biological matrices The present invention provides a reagent for extracting lead ions from a variety of biological matrices such as human whole blood that has been anticoagulated with either heparin or EDTA, and lyophilized human blood and bovine EDTA whole blood. The releas... | 11/27/2001 |
| 6248593 | Handwipe disclosing method for the presence of lead A method of detecting lead contamination of a surface is disclosed. A handwipe issued to collect any lead contamination on the surface. The lead is solubilized with an aqueous acid solution and treated with rhodizonate or sulfide anions. A change in color... | 06/19/2001 |
| 6248592 | Method for measuring lead concentrations in blood Method for measuring lead concentrations in blood. The present invention includes the use of resonant laser ablation to analyze ࣘ1 μL (or equivalent mass) samples of blood for lead content. A typical finger prick, for example, yields about 10 μL. Soli... | 06/19/2001 |
| 6228651 | Preparation of analytical samples, analysis of impurities, preparation of highly purified phosphoric acid and production of semiconductor devices A process for the preparation of an analytical sample characterized by depositing and separating solely the impurity to be analyzed from phosphoric acid; a process for analysis of the impurity characterized by depositing and separating solely the impurity... | 05/08/2001 |
| 6225127 | Enzyme-based fluorescence biosensor for chemical analysis This invention generally relates to the detection, determination, and quantitation of certain ions and small molecules involving the quenching of a fluorescent label attached to a macromolecule, often due to fluorescence energy transfer to a colored inhib... | 05/01/2001 |
| 6225128 | Color test card package for testing for the presence of lead A package comprises a sealed plastic envelope containing a small amount of desiccant sufficient to absorb the moisture in the air entrapped in the envelope. The package contains a dry test card having at least one circular area coating of a dry solid rhod... | 05/01/2001 |
| 6171552 | Hydride formation analytical apparatus The present invention provides for a hydride formation analytical apparatus which forms hydrides of target components contained in a sample liquid and then analyzes them. The hydride formation analytical apparatus comprises a sample-introducing part, a re... | 01/09/2001 |
| 6037182 | Method for detecting a location of contaminant entry in a processing fluid production and distribution system A method is used to detect a location of contaminant entry in a processing fluid production and distribution system. A wafer is placed in a clean container. The clean container is connected to a test point within the processing fluid production and distri... | 03/14/2000 |
| 5952236 | Enzyme-based fluorescence biosensor for chemical analysis This invention generally relates to the detection, determination, and quantitation of certain ions and small molecules involving the quenching of a fluorescent label attached to a macromolecule, often due to fluorescence energy transfer to a colored inhib... | 09/14/1999 |
| 5912180 | Process and apparatus for testing for substances in liquids A method for detecting a substance in a liquid sample involves precipitating a substance from the liquid sample and filtering it from the liquid sample. The precipitate is then tested for the substance of interest by contacting the precipitate with a dye ... | 06/15/1999 |
| 5683907 | Metal ion-ligand coordination complexes, antibodies directed thereto, and assays using such antibodies The present invention relates to the field of immunossays for metal ions. The invention presents: metal ion-ligand coordination complexes ("MLC"), novel ligands, antibodies specific for MLC, immunoassays utilizing the foregoing, and methods for selecting ... | 11/04/1997 |
| 5672257 | Electrochemical metal analysis Electrochemical heavy metal analysis includes a printed electrode having a layer of a mercury compound or salt supported thereon. The compound or salt is reduced to metallic mercury in use of the electrode. The mercury layer may comprise a layer of hydrox... | 09/30/1997 |
| 5654160 | Metal ion-ligand coordination complexes, antibodies directed thereto, and assays using such antibodies The present invention relates to the field of immunoassays for metal ions. The invention presents: metal ion-ligand coordination complexes ("MLC"), novel ligands, antibodies specific for MLC, immunoassays utiliizing the foregoing, and methods for selectin... | 08/05/1997 |
| 5648268 | Radionuclide exchange detection of ultra trace ionic impurities in water The present invention is directed to an analytic method for detecting trace elements in fluid solution. A cation exchange resin is packed with a radiolabelled exchange material having certain characteristics and replaces the trace element ions in the flui... | 07/15/1997 |
| 5567619 | Process and apparatus for testing for substances in liquids A method for detecting a substance in a liquid sample involves precipitating a substance from the liquid sample and filtering it from the liquid sample. The precipitate is then tested for the substance of interest by contacting the precipitate with a dye ... | 10/22/1996 |
| 5558835 | Lead test dauber A device for testing for the presence of lead on a painted surface includes a porous dauber formed from an absorbent sintered plastic. The dauber is preimpregnated with a powdered mixture containing rhodizonate dye which is activated by dipping the dauber... | 09/24/1996 |
| 5532136 | Monoclonal antibody assay and kit for detecting metal cations in body fluids The invention provides method and kits for detecting a metallic cation in a sample of a body fluid. The preferred method and kits include the use of at least two different types of antibodies having different specificities. In the preferred method, the sa... | 07/02/1996 |
| 5518886 | Blood lead diagnostic assay Diagnostic blood lead assays using porphobilinogen synthase protein function as an indicator of physiological response to lead exposure and as an indicator of the time period of lead exposure are disclosed.... | 05/21/1996 |
| 5514593 | Time averaged toxic metals monitoring method An improved device for monitoring the presence of toxic metals in workplace air comprises a base and a removable top assembly. The top assembly includes a test substrate, such as filter paper, having a first surface and a second surface. The first surface... | 05/07/1996 |
| 5496736 | Process for testing for substances in liquids A method and apparatus for the detection of nutrients and contaminants in a liquid sample. The sample is added to a container which is then capped with a cap assembly which contains crushable reagent containers. As the cap is tightened, the crushable caps... | 03/05/1996 |
| 5492835 | Swab identification testing device and method A testing apparatus and method for the immediate testing of painted surfaces to determine the type of paint and/or presence of mildews or lead wherein the apparatus includes an outer resealable wrapper and at least one test packet including a secondary sw... | 02/20/1996 |
| 5468366 | Colloidal-gold electrosensor measuring device The present invention provides a new device for use in measuring lead levels in biological and environmental samples. Using square wave coulometry and colloidal gold particles impregnated on carbon electrodes, the present invention provides a rapid, relia... | 11/21/1995 |
| 5459040 | Enzyme amplified, complex linked, competitive and non-competitive assays for the detection of metal ions Methods of assaying for the presence or amount of a metal ion in a sample suspected of containing such ions. In one aspect, an enzyme amplified sandwich assay is provided which relies upon the ability of the analyte (metal ion) to form a complex with two ... | 10/17/1995 |
| 5445965 | Process and apparatus for testing for substances in liquids A method and apparatus for the detection of nutrients and contaminants in a liquid sample. The sample is added to a container which is then capped with a cap assembly which contains crushable reagent containers. As the cap is tightened, the crushable caps... | 08/29/1995 |
| 5427953 | Blood testing method A method for testing blood samples for determining lead content therein. The method utilizes filter collection paper that is spotted with a blood sample; the blood sample spotted thereon is allowed to dry. The dried blood sample on the paper is punched ou... | 06/27/1995 |
| 5416028 | Process for testing for substances in liquids A method for detecting a substance in a liquid sample involving precipitating a substance from the liquid sample and filtering it from the liquid sample. The precipitate is then contacted by an oxidizing agent and tested for the substance of interest by c... | 05/16/1995 |
| 5368707 | Convenient determination of trace lead in whole blood and other fluids The invention relates to methods of determining micromolar levels of lead ion in various fluids, including blood. Detection of lead or other heavy metal ion concentrations as low as 1 μg/dL is achieved. The methods are adaptable to the detection of low l... | 11/29/1994 |
