Matches 201 - 250 out of 316 < 1 2 3 4 5 6 7 >
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5001048 Electrical biosensor containing a biological receptor immobilized and stabilized in a protein film  
An electrical biosensor for analyte determination is prepared by polymerization of a mixture of a biological receptor capable of binding an analyte in a sample, a protein and a polymerizing agent...
4994394 Method of using a thermal shock probe, a thermal shock probe usable in the method and application of this method  
The present invention provides a method of using a thermal shock probe, such a thermal shock probe and application of this method to the control of a heat pump. The method of using a thermal shock...
4992384 Measuring apparatus and method of use for analyzing a gas mixture  
The invention relates to a measuring apparatus for analyzing a gas mixture for at least one gas contained therein in a very low concentration. Such a gas can, for example, be anesthesia gas in...
4942133 Procedure for the continuous analysis of the chloride ions present in the overhead waters of a hydrocarbon distillation column  
Procedure and apparatus for the continuous analysis of the chloride ion content of overhead waters downstream of a hydrocarbon distillation column for more effectively preventing hydrochloric acid...
4888295 Portable system and method combining chromatography and array of electrochemical sensors  
A portable system for analyzing a fluid sample includes a small, portable, low-pressure and low-power chromatographic analyzer and a chemical parameter spectrometry monitor including an array of...
4870024 Concurrent analysis of a fluid sample for calcium and a monovalent ion  
A method for determining the concentrations of total calcium and at least one monovalent ion in a sample includes the steps of mixing the sample with a diluent that has a pH within the range pH 6.5...
RE32920 Electrochemical testing system and method  
An electrochemical measuring system which effects, measures and sorts charge transfer reactions of selected substances in a sample solution is provided. The system includes a novel electrode which...
4814281 Differential conductivity sulfate monitor  
A differential conductivity sulfate monitor for determining the sulfate concentration of a fluid sample by monitoring the cation conductivity of the fluid sample before and after sulfate has been...
4810657 Method of diagnosing multiple sclerosis and other diseases by measurement of blood plasma protein streaming potential  
Multiple sclerosis and other diseases are diagnosed by first coating a plasm protein-adsorbing surface with a patient's blood plasm protein in an electrolyte fluid, and measuring the streaming...
4808538 Method and device for measuring the corrosivity of liquids  
According to the invention a piezoelectric crystal, e.g. a quartz crystal, coated with a metal or another suitable material is exposed to the action of a corrosive liquid, preferably by being...
4801543 Process and device for the differentiation of particles in a medium  
Disclosed is a process and device for facilitating the differentiation of particles in a medium. The particles, which belong to at least two different groups of particles, are enclosed in a chamber...
4777019 Biosensor  
This invention introduces a new class of devices for detecting the presence of biological molecules. The construction principle of the device involves the direct introduction of small monomers of...
4755473 Method of detecting carbon dioxide gas  
The presence of carbon dioxide contained in a gas can be detected through measurement of the change in the electrical resistance of a hydroxyapatite in contact with carbon dioxide gas. The...
4755470 Process and an apparatus for measuring the relative equilibrium moisture content  
A process for measuring the relative equilibrium moisture content, particularly of surface samples such as papers, films, woven material or the like, with which the sample is introduced into a...
4744954 Amperometric gas sensor containing a solid electrolyte  
An electrochemical gas sensor is described incorporating a sensing electrode, a reference electrode, a solid matrix containing an alkali salt, a potentiostat and a heater. The invention overcomes...
4722905 Semiconductors  
A gas sensor element comprising a film of a semiconducting compound of formula I supported by a non-conductive substrate, the film being disposed between conductors for supplying a current to the...
4717673 Microelectrochemical devices  
Very stable, polymer-based electrochemical devices, formed by polymerization of thiophene or a derivative such as 3-methylthiophene which is durable in an aqueous electrolyte over a wide pH range,...
4710353 Corrosive liquid leak detecting sensor  
A detector for detecting leaks of a corrosive liquid such as strong acids or bases is provided comprising a light guide core having a covering which generates heat upon contact with the liquid to...
4680270 Method and apparatus for conducting flow analysis  
A single sampling tube is inserted into a whole blood sample contained in a sample cup, and the blood introduced into a switch-valve and a first channel without being diluted. The switch-valve has...
4673652 Method of testing and reconditioning insulating tubular conduits  
A non-destructive on-site method of inspection, and testing of the insulating performance and reconditioning of a concentric insulating tubular conduit member is disclosed. The insulating tubular...
4670405 Sensor array for toxic gas detection  
A portable instrument for use in the field in detecting and identifying a hazardous component in air or other gas including an array of small sensors which upon exposure to the gas from a pattern...
4637987 Gas monitoring device and method  
Method and apparatus which can provide continuous monitoring of the partial pressure of one or more gases in an atmosphere or feed stream, over an indefinite period of time and at a minimal cost....
H000201 Biosensors from membrane proteins reconstituted in polymerized lipid bilayers  
A compact and portable biosensor which can detect the presense of an environmental stimulus is produced by extracting cell membrane proteins which are specific for the stimulus, purifying the...
4626506 Process and device for the determination of cells secreting cellular contents  
Disclosed is a process and device for determining which cells of a suspension containing cells of the same species and genus are secreting cellular substances. Such determinations are made by...
4572900 Organic semiconductor vapor sensing method  
A method and apparatus to automatically compensate for temperature variation in a vapor detection system. In one embodiment, two identical organic semiconductor film sensors in close thermal...
4560534 Polymer catalyst transducers  
Polymer-catalyst transducers are used for detecting one or more constituents in a sample. Changes in conductivity of the polymer-catalyst transducers as a result of electron density changes are...
4551425 Pyroelectric gas sensor  
A pyroelectric substrate is provided with a heater and at least one set of electrodes for sensing charge redistributions due to changes in the substrate temperature. In a preferred embodiment,...
4455378 Method of determining the content of an anesthetic gas in a selected location  
An apparatus for and method of determining the content of an anesthetic gas in a selected location is disclosed which comprises heating a sensor layer containing phthalocyanine, measuring the...
4444892 Analytical device having semiconductive organic polymeric element associated with analyte-binding substance  
A method, sensor and semiconductor device for determining the concentration of an analyte in a medium. The device features an element constructed of semiconductive organic polymer associated with a...
4391777 Apparatus for measuring breath alcohol  
A method of measuring breath alcohol includes blowing breath in a stream through an inlet line, hence through an orifice, past a thermistor exposed to the stream, changing the temperature of the...
4391775 Method of and system for determining particular species of chlorine in a water sample  
A technique for determining and distinguishing between specific species of chlorine in a supply of water is disclosed herein along with certain applicable apparatus. In carrying out this technique,...
4368423 Apparatus for determining cell membrane dielectric breakdown  
An apparatus which enables cell membrane dielectric breakdown to be determined. This determination is essential for the rapid inexpensive, reliable, in vitro quantification of lymphocyte tumor-cell...
4357143 Determining ion concentration  
A method for determining the concentration of a specific ion in a solution which involves dividing the solution to be analyzed into two portions. One portion is treated with an ion exchange resin...
4321057 Method for quantitative analysis using optical fibers  
A method and apparatus for chemical and biochemical analyses which employ an energy-transmissive core and may employ one or more sheaths which selectively absorb, react with, and/or filter an...
4315753 Electrochemical apparatus for simultaneously monitoring two gases  
The gas monitor of the present invention is capable of simultaneously determining the concentrations of two members of a family of oxygen-containing gases present in an air sample. The monitor...
4297173 Method for determining ammonia and sensor therefor  
The concentration of ammonia in an aqueous liquid is determined by contacting a sample of the liquid with dissolved oxygen and with a microbial electrode comprising an oxygen-sensitive electrode, a...
4294801 Gas component detector  
A gas component detector for detecting a gas component in the exhaust gases includes a detector element of a metal oxide whose electrical resistance value varies suddenly depending on the gas...
4288229 Determination of total organic carbon in a plurality of aqueous samples containing halide ion  
Total organic carbon can be determined for each one of a plurality of discrete aqueous samples containing halide ion by means of an apparatus comprising a reactor (13), and a pump (12) and flowline...
4277439 Gas component detector  
In a gas component detector, a first gas component detecting element is formed by a metal oxide having an electric resistance depending on the concentration of gas components and on the temperature...
4264331 Charged non-conductive polar gas sensing element and detection system  
An air pollutant and/or fire combustion sensing apparatus includes a charged insulating sensing electrode layer establishing an electric field as the result of electric dipoles and/or electric...
4251225 Method of detecting carbon monoxide  
Method of detecting carbon monoxide gas at temperatures of 100° C. or less by using a detecting element containing stannic oxide as the main component, which element is prepared by mixing stannic...
4247299 Non-conductive polar gas sensing element and detection system  
An air pollutant and/or fire combustion sensing apparatus includes a sensing electrode having an electrically non-conductive or dielectric sensing layer which has a surface resistivity in excess of...
4246228 Combustible gas detectors  
The invention relates to combustible gas detectors of the kink in which a heatable wire filament exhibits a change in resistance due to a change in its temperature caused by the oxidation of a...
4243631 Solid state sensor  
A solid state sensor that is ideally well suited for detecting the presence of ozone in an atmosphere under ambient conditions. A metal oxide semiconductor is placed upon a glass substrate by...
4240799 Sensing the presence of ozone  
A means for detecting and/or measuring the presence of ozone in an atmosphere such as air. A solid state sensor that is capable of changing its conductivity in the presence of ozone is located...
4238757 Field effect transistor for detection of biological reactions  
A field effect transistor including conventional source and drain electrodes employs, in the gate region, a layer of antibody specific to a particular antigen. An electrolyte solution such as 0.155...
4236307 Method of making a nitrogen dioxide sensing element  
A method of making an element for sensing the presence of nitrogen dioxide gas in the environment. The element is formed by heating a film of an electrically non-conductive polyaromatic polymer to...
4228128 Exhaust gas sensor having porous, metal-impregnated ceramic element  
An improved sensor having a ceramic element that undergoes a change in an electrical characteristic in response to a change in the partial pressure of oxygen in a mixture of gases to which the...
4225559 Ceramic element sensor  
An improved sensor having a ceramic element that undergoes a change in an electrical characteristic in response to a change in the partial pressure of oxygen in a mixture of gases to which the...
4211614 Endpoint drift correction for automatic titrations  
An apparatus and method are described for automatically correcting drift in automatic titrations, such as coulometric titrations of water. An endpoint detector provides a signal indicative of the...
Matches 201 - 250 out of 316 < 1 2 3 4 5 6 7 >