| Patents for G01N 31 - Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroups; Apparatus specially adapted for such methods (18,554) |
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| 07/30/1991 | US5035860 Pesticides and chemical warfare agents, colorimetric |
| 07/24/1991 | EP0437624A1 Testing device for bodily fluid |
| 07/23/1991 | CA1286577C Cobalt(iii) reagents in combination with water soluble polymers |
| 07/18/1991 | DE4001031A1 Indicator for testing gases in mixts. - prepd. by dissolving indicator and plastic in solvent, casting soln. and drying off, used for personal dosimeters |
| 07/17/1991 | EP0437405A1 Method and device for determining total nitrogen |
| 07/16/1991 | US5032526 Anitscale concentration for water treatment systems |
| 07/16/1991 | US5032380 Bis/2-chloroethyl/ sulfide and 2-chloroethyl ethyl sulfide |
| 07/13/1991 | CA2034066A1 Method and apparatus for the determination of total nitrogen |
| 07/10/1991 | EP0245309B1 Analytic apparatus and method |
| 07/10/1991 | CN1052948A Equipment for testing structure of carbon black |
| 07/09/1991 | CA1285872C Binder composition and analytical element having stabilized peroxidase in layer containing the composition |
| 07/09/1991 | CA1285753C Apparatus for moistening test strips |
| 07/09/1991 | CA1285721C Device composed of polymers with a membrane structure and incorporated solids particles |
| 07/04/1991 | DE3942229A1 Total inorganic carbon extn. before carbon analysis - uses acid in gaseous form mixed with extractor gas and water |
| 07/03/1991 | EP0435122A1 Karl-Fischer-reagent and method for the determination of water using this reagent |
| 07/03/1991 | EP0435089A2 Easy handling reagent strip |
| 07/03/1991 | EP0424465A4 Preparation and use of fluorescent benzothiazole derivatives |
| 07/02/1991 | US5028543 Analyzing for PCB, slurrying in water, solvent extraction, reaction to form alkali halide followed by reaction with mercuric nitrate, colorimetric analysis |
| 07/02/1991 | US5028542 Glucose measurement control reagent and method of making the same |
| 06/26/1991 | EP0433854A2 3-Aminopyrazolo heterocycles, their use for the determination of hydrogen peroxide, hydrogen peroxide forming systems, peroxidase, peroxidant active substances or electron rich aromatic compounds, corresponding determination process and agents |
| 06/26/1991 | EP0433833A1 Indole reagent |
| 06/26/1991 | EP0433642A1 Karl-Fischer reagent and process for the determination of water by using the reagent |
| 06/26/1991 | EP0433499A1 Apparatus for monitoring the quality of water |
| 06/26/1991 | EP0433382A1 Method and apparatus for chemical species determination. |
| 06/26/1991 | CN2079753U Tester for light and heavy volatile oils |
| 06/25/1991 | US5026652 Method and device for mercury analysis |
| 06/23/1991 | CA2030432A1 Indol reagent |
| 06/19/1991 | EP0433211A2 Apparatus for refrigerant testing in a closed system |
| 06/19/1991 | EP0432642A1 A method for quantitation of calcium and magnesium |
| 06/19/1991 | CN1052375A Cod measuring method without mercury |
| 06/18/1991 | US5025389 Method of analyzing reaction rate in chemical analysis |
| 06/18/1991 | US5024108 Sample analyzer |
| 06/18/1991 | CA1284932C Biological and analytical uses of phenalenone and benzphenalenone compounds |
| 06/13/1991 | WO1991008472A1 Process and apparatus for simultaneous measurement of sulfur and non-sulfur containing compounds |
| 06/13/1991 | WO1991008466A1 Selective detection of vapors |
| 06/12/1991 | EP0431025A1 Smog monitor and method |
| 06/12/1991 | CN1052192A Testing tube of hydrogen phosphide gas |
| 06/12/1991 | CN1052189A Testing tube of co2 gas |
| 06/11/1991 | US5023052 Multilayer; light transmitting support, porous layers containing detectable optical reagent |
| 06/11/1991 | CA1284729C Process for the characterisation of a catalyst through the determination of its conversion and cooking activities |
| 06/05/1991 | EP0430371A2 Dry immunoassay analytical element comprising monodispersed beads |
| 05/31/1991 | CA2013014A1 Dry immunoassay analytical element comprising monodispersed beads |
| 05/30/1991 | WO1991007659A1 Gas sensors and compounds suitable therefor |
| 05/30/1991 | WO1991007658A1 Gas sensors and compounds suitable therefor |
| 05/29/1991 | CN2078003U Apparatus adapted for determing method of carbon dioxide |
| 05/28/1991 | US5019518 Process for the detection of chemical warfare agents |
| 05/28/1991 | US5019517 System, detector and method for trace gases |
| 05/28/1991 | US5019347 Integral multilayer analytical element |
| 05/28/1991 | US5018348 Method for detecting the condition of catalytic converters |
| 05/23/1991 | DE4037177A1 Single reagent titration compsn. of integral Karl-Fischer - is highly stable and is used in determination of small amts. of water in solids or liquids |
| 05/22/1991 | EP0427955A1 Method for determining sulfur loading in organic polysulfides |
| 05/21/1991 | US5017499 Method for analyzing fluorine containing gases |
| 05/21/1991 | US5017498 Medical diagnosis |
| 05/21/1991 | US5017427 Ability to change colors upon contact with acid or alkali; for working gloves |
| 05/21/1991 | US5017339 Apparatus for measuring the components of a sample |
| 05/21/1991 | US5016482 Method of taking a proportional sample of flowing gas in a line |
| 05/17/1991 | CA2029549A1 Apparatus and method for detecting the presence and concentration of weak acids and bases in liquids |
| 05/16/1991 | WO1991006848A1 Method of measuring total quantity of organic substances in ultrapure water and ultrapure water treating system utilizing said method in preparation of ultrapure water |
| 05/16/1991 | CA2029839A1 Method of detecting the concentration of an active ingredient in an aqueous system |
| 05/15/1991 | EP0290473A4 Use of lanthanide chelate fluorophores based on dihydropyridine condensation products |
| 05/14/1991 | US5015715 Method for bonding an analyte-sensitive dye compound to an addition-cure silicone |
| 05/14/1991 | CA1284017C Riser simulator |
| 05/08/1991 | EP0425487A1 Method and apparatus for determining the ability of heavy fuels to self-ignite under diesel conditions. |
| 05/08/1991 | CN2076445U Parallel rubber cap buret |
| 05/07/1991 | US5013668 Method of estimating a cumulative exposure to a compound of a gas and apparatus therefor |
| 05/07/1991 | US5013667 Apparatus and method for measuring halogen content |
| 05/07/1991 | US5013528 Analysis of organic material |
| 05/07/1991 | US5013527 Sample containing interfering protein, spreading layer containing pH buffer, indicator in spreading layer being dispersed in hydrophilic polymer |
| 05/03/1991 | CA2028182A1 Method for determining sulfur loading in organic polysulfides |
| 05/02/1991 | WO1991005993A1 Process for determining the optimal size of catalyst particles for use in heterogenous catalysis |
| 05/02/1991 | EP0425385A1 Determination method of the natural iodine content of drinking water |
| 05/02/1991 | EP0424799A1 Method for determining the carbonate content of wash suspensions |
| 05/02/1991 | EP0424465A1 Preparation and use of fluorescent benzothiazole derivatives. |
| 05/02/1991 | DE4031882A1 Electrochemical cell measures incompletely oxidised methane - in gas or waste air stream flowing continuously through heated reactor |
| 05/01/1991 | CN1012531B 过氧乙酸测定试纸及其制备方法 Determination of peracetic acid paper and its preparation method |
| 04/28/1991 | CA2028651A1 Process for determining iodine content of drinking water |
| 04/28/1991 | CA2028434A1 Method for determining the carbonate content of washing suspensions |
| 04/24/1991 | EP0423801A1 Process and apparatus for detecting sensitized leukocyte |
| 04/24/1991 | EP0423294A1 Computerized unit for the study and evaluation of fcc catalysts. |
| 04/24/1991 | EP0423251A1 Assay for qualitative and quantitative detection of organic and inorganic analytes of diverse chemical classes via the selective formation and growth of light scattering crystals |
| 04/24/1991 | CN1050930A Minimum procedure system for determination of analytes |
| 04/23/1991 | US5010022 Method for determining sulfur loading in organic polysulfides |
| 04/23/1991 | US5010020 Extraction of lead using citric acid solution on filter paper |
| 04/23/1991 | US5009849 Apparatus for carrying out catalyzed chemical reactions and for studying catalysis |
| 04/23/1991 | US5009845 Chemical agent detectors for chemical nerve agents |
| 04/23/1991 | US5009591 Pyrolyzer for gas chromatography |
| 04/23/1991 | CA1283368C Chromatographic cassette |
| 04/18/1991 | WO1991005252A1 Carbon dioxide monitor |
| 04/18/1991 | WO1991005251A1 A method for determining the content of organic pollution in a liquid and/or gaseous medium |
| 04/18/1991 | WO1991005242A1 Method of testing oils |
| 04/18/1991 | CA2067098A1 Method of testing oils |
| 04/16/1991 | US5008203 Method for the determination of oxygen demand in sulfur recovery installations |
| 04/16/1991 | US5008080 Binding assay for antigens or DNA |
| 04/16/1991 | US5008078 Used for quantitative analysis of ammonia producing body fluids |
| 04/16/1991 | US5008077 Having elongated carrier with handle projection |
| 04/10/1991 | CN1050612A Quantitative analysis method for oil and gas constituents of oil reservoir rock |
| 04/09/1991 | US5006458 Accuracy |
| 04/09/1991 | US5006314 Monitoring oxygen partial pressure of blood |
| 04/09/1991 | US5006312 Quantitative analysis |
| 04/09/1991 | US5005572 Ph sensitive dye on support |