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| Number | Title | Issue Date |
| 7799572 | Stabilized powdered formaldehyde According to an aspect of the invention, a polymerized form of formaldehyde is available in granular form containing a polymerized form of formaldehyde, such as paraformaldehyde, a buffer, such as sodium phosphate dibasic anhydrous, and a stabilizer, such as hydroxy... | 09/21/2010 |
| 7790467 | Diode laser based ketone and aldehyde detection An apparatus and method for quantifying ketone or alydehyde concentrations of gas. The invention includes passing a gas sample through a reactor and an optical cell and determining a concentration of a gaseous reaction product. Using the concentration of the gaseous... | 09/07/2010 |
| 7101716 | Formaldehyde detecting material A detecting material to detect formaldehyde at low concentration in the atmosphere in a short time is prepared by impregnating a base material containing at least silica gel with a coloring liquid containing 4-amino-4-phenyl-3-ene-2-one and a buffer solution and vol... | 09/05/2006 |
| 7087434 | Automatic portable formaldehyde analyzer An apparatus for measuring the concentration of formaldehyde in an exhaust stream from turbines, internal combustion engines and the like, which apparatus includes a portable housing having a sample gas inlet through which a sample gas for analysis is introduced int... | 08/08/2006 |
| 6913932 | Formaldehyde-ammonium salt complexes for the stabilization of blood cells A stabilization reagent composition, particularly desirable for stabilizing blood samples containing platelets, contains reactants that generate multiple species of formaldehyde-ammonium complexes; at least one inhibitor of phosphatase enzymatic activity; and at lea... | 07/05/2005 |
| 6902700 | Method and device for testing aldehyde in polyester polymer A test strip, methods for making and using the test strip, and a kit are described, which allow for the simple and efficient determination of the acetaldehyde content in a polyester polymer. The strip and methods have application, for example, in the manufacture of ... | 06/07/2005 |
| 6835573 | Method and device for testing aldehyde in polyester polymer A test strip, methods for making and using the test strip, and a kit are described, which allow for the simple and efficient determination of the acetaldehyde content in a polyester polymer. The strip and methods have application, for example, in the manufacture of ... | 12/28/2004 |
| 6818450 | Use of infrared spectroscopy for on-line process control and endpoint detection The present invention is directed to an analytical method for measuring the concentration of an N-(phosphonomethyl)iminodiacetic acid (“NPMIDA”) substrate, an N-(phosphonomethyl)glycine product, formaldehyde, formic acid, N-methyl-N-(phosphonomethyl)glycine (“... | 11/16/2004 |
| 6706526 | Low formaldehyde producing blood diluent A low formaldehyde containing aqueous blood diluent contains an effective amount of ethylenediamine tetraacetic acid, ethylenediamine tetraacetic acid derivative, or combinations thereof; an effective amount of 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-i... | 03/16/2004 |
| 6689617 | Agent for detecting malondialdehyde, method of making the same, and test kit for use thereof A reagent for use in detecting the presence of aldehyde particularly in an aqueous solution, urine, or other body fluids comprising a solution sodium metabisulfite, phosphoric acid, basic fuchsin (BA 130) and deionized water. The sodium metabisulfite is p... | 02/10/2004 |
| 6541267 | Methods for testing oxidative stress Method and compositions for determining oxidative stress in a subject are provided in which presence of an aldehyde in a biological fluid is correlated with an oxidative stress in a subject. A test reagent having a pH regulator, a reducing agent, and an a... | 04/01/2003 |
| 6436311 | Sampling material for a carbonyl compound in a gas A sampling material for a carbonyl compound in a gas comprising a reagent capable of converting a carbonyl compound to a derivative thereof supported on a cation exchanger; and a sampling cartridge for a carbonyl compound in a gas wherein a sampling mater... | 08/20/2002 |
| 6436716 | Aldehyde test strip A composition, method, and device for quantitatively determining the concentration of an aldehyde in a sample are disclosed. The device includes a test pad having a suitable carrier matrix incorporating an indicator reagent composition capable of interact... | 08/20/2002 |
| 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 |
| 6165797 | Methods for testing oxidative stress Urine is tested for presence of malondialdehyde by mixing it with a reagent consisting of about 90-110 parts 20% acetic acid, about 13.5-16.5 parts Ingredient A, and about 4.5-5.5 parts Ingredient B, wherein Ingredient A is comprised of sodium metabisulfi... | 12/26/2000 |
| 6136608 | Method for determining formaldehyde present in air The concentration of formaldehyde in air is measured by the method of the invention. More specifically, the invention relates to a method for analyzing formaldehyde in air by collecting the air and implementing an analysis of the concentration of formalde... | 10/24/2000 |
| 5932434 | Method for identifying weeds resistant to inhibitors of acetolactate synthase Resistance of given plant tissue to an inhibitor of acetolactate synthase is identified by (a) combining in an aqueous medium a sample of the plant tissue, the inhibitor of acetolactate synthase, and an inhibitor of keto acid reductoisomerase; (b) allowin... | 08/03/1999 |
| 5766952 | Vapochromic platinum-complexes and salts The present invention relates to a process for indicating the presence of organic vapors comprising the steps of determining the color, absorption or emission spectra of a Pt--Pt double-complex salt of platinum or a neutral platinum complex in the absence... | 06/16/1998 |
| 5538899 | Analyzing for alkyl ketene dimers A method of analysing a sample for alkyl ketene dimer (AKD) comprises treating the sample (or extract thereof) with a reagent which will react with an AKD to produce a detectable derivative. The preferred reagent is 4-(N,N'-dimethylamino)pyridine.... | 07/23/1996 |
| 5525522 | Method for fixing a biological preparation Biological preparations or specimens are treated for a subsequent microscopic inspection. For this purpose it is necessary that the inner structure that is to be studied does not change prior to and during inspection. It is thus necessary to subject the s... | 06/11/1996 |
| 5447688 | Detector, and method of using same A detector, which is source specific, for detecting a fugitive emission from a component containing a gaseous or volatile analyte, and is adaptable for adjacent disposition to the component. The device includes (a) a substrate for disposition adjacent the... | 09/05/1995 |
| 5372947 | Assay for an aldehyde or a compound capable of releasing an aldehyde An aqueous sample containing methylenebisthiocyanate or another compound capable of releasing an aldehyde is assayed by determining the amount of aldehyde released by conversion with respect to a sample from which existing aldehydes have been separated. A... | 12/13/1994 |
| 5332548 | Analytical device and method of using same The invention provides an analytical device, and method of using same, for detecting a gaseous or volatile analyte and adaptable to be applied directly to the surface of a solid material from which said analyte is emitted. The device comprises a substrate... | 07/26/1994 |
| 5290702 | Method of detecting and mapping organic solvent-containing materials on a surface Chromogenic solvent detectors are used to detect and map the presence of organic solvent-containing materials on a surface. The detector need only be applied to the surface to be tested. When removed, the dark areas on the detector correspond to those are... | 03/01/1994 |
| 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 |
| 5205988 | Apparatus for measuring gaseous aldehyde An apparatus for detecting gaseous aldehydes is disclosed which contains a detachable aldehyde capturing system and an aldehyde detection system. The gaseous aldehyde is passed across a semipermeable membrane with a solvent on the other side of this semip... | 04/27/1993 |
| 5132227 | Monitoring formaldehyde Methods and apparatus for monitoring formaldehyde vapor in a gas, comprising directing the gas into contact with an aqueous acidic solution that can dissolve the vapor and thus collect it therein, separating the gas from the solution, reacting the solutio... | 07/21/1992 |
| 5106647 | Method to manufacture gas monitoring test strips A simple, inexpensive, and versatile device for measuring gaseous substances and a method for manufacture of such devices are described. The device comprises a reflectant backing upon which is disposed a layer which is composed of microparticles coated wi... | 04/21/1992 |
| 5071769 | Method and device for ketone measurement Methods and materials detect ketone and aldehyde analytes in fluid samples by reacting analyte containing samples with a first solid matrix material to which a nitroprusside salt is coupled and a second solid matrix material to which an amine is covalentl... | 12/10/1991 |
| 4970172 | Method and device for ketone measurements The present invention relates to methods and materials for the detection of ketone and aldehyde analytes in fluid samples by means of reacting analyte containing samples with a first solid matrix material to which a nitroprusside salt is coupled and a sec... | 11/13/1990 |
| 4946705 | Integrated exposure monitoring device A simple, inexpensive, and versatile device for measuring gaseous substances and a method for manufacture of such devices are described. The device comprises a reflectant backing which is disposed a layer which is composed of microparticles coated with a ... | 08/07/1990 |
| 4931404 | Method and device for ketone measurement The present invention relates to methods and materials for the detection of ketone and aldehyde analytes in fluid samples by means of reacting analyte containing samples with a matrix comprising a hydrazine compound coupled to an H+ ion exchang... | 06/05/1990 |
| 4758521 | Assay of ketones in ambient air A method of assaying ketones in ambient air comprising contacting the air with beaded activated carbon followed by desorption with a solvent and analysis of the solvent solution for ketone content has been developed which provided superior results over pr... | 07/19/1988 |
| 4753891 | Schiff test for rapid detection of low levels of aldehydes An improved Schiff's reagent for detection of aldehydes (such as formaldehyde and gluteraldehyde) contains a para-rosaniline compound (such as para-rosaniline hydrochloride), orthophosphoric acid, a bisulfite compound (such as sodium metabisulfite), a pho... | 06/28/1988 |
| 4666859 | Reagent for colorimetrically indicating the presence of formaldehyde A novel colorimetric reagent for the selective determination of formaldehyde in solution or in air is described. The reagent comprises at least two chemicals: rubeanic acid or a rubeanic acid derivative, and a cyano complex of a metal. Upon addition of fo... | 05/19/1987 |
| 4588696 | Pellet process for the detection of formaldehyde and/or glutaraldehyde A kit containing three tablets is used in a process for testing for formaldehyde and/or glutaraldehyde in a sensitive, rapid, and simple manner that is practical even when glucose is present. A first tablet containing citrus acid and glycine hydrochloride... | 05/13/1986 |
| 4552849 | Method for determination of formaldehyde In a method of formaldehyde determination by measuring the fluorescence of a fluorescent substance formed by the reaction of a formaldehyde-containing solution with a fluorescent reagent capable of forming said fluorescent substance by the reaction with f... | 11/12/1985 |
| 4511658 | Colorimetric detector for formaldehyde vapor A sensitive colorimetric detector for formaldehyde vapor is prepared by applying a ketone solution of 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AHMT) to a support coated with a stable metal bicarbonate to form a compound from which the ketone ca... | 04/16/1985 |
| 4489164 | Colorimetric method for detecting aldehydes in air A transparent glass detection tube contains a bed of silica gel which has been impregnated with sulfuric acid. One end of the tube is open to the outside air while the other end is connected to a sampling pump. Outside air is drawn through the tube and al... | 12/18/1984 |
| 4466942 | Gaseous contaminant dosimeter A personal dosimeter for the collection of formaldehyde is improved by modifying the sodium bisulfite absorbant medium with sodium bicarbonate.... | 08/21/1984 |
