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4659434 |
Gas sensor
Gas detection electrochemical cell featuring, in one aspect, a liquid electrolyte free of any salt capable of dissociating to form in said electrolyte a weak acid or weak base (other than H 3 O + ...
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4650547 |
Method and membrane applicable to implantable sensor
This invention relates to a novel membrane useful in an electro-chemical, optical or other sensor device and to a method employing the membrane for determining the concentration of large molecule...
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4637861 |
Stabilized, lipid membrane-based device and method of analysis
A stabilized, lipid membrane-based device is provided. This device includes a plurality of membrane-forming lipids, and a support for stabilizing the lipid membrane. Each membrane-forming lipid...
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4627893 |
Means and methods for quantitative determination of analyte in liquids
A testing module is provided having units which can be arranged seriatim to provide narrow through passageways linked to each other for quantitative determination of analytes passing through the...
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4579631 |
Measurement of oxygen concentration
A system is disclosed for measuring the oxygen concentration in a fluid contained in a fermentation vessel, comprising a fermentation vessel containing a nozzle aperture disposed in the wall...
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4578154 |
Method and apparatus for measuring dissolved gas concentrations
Two dissolved gas components in sample water, for example, oxygen and hydrogen in core water, are readily quantitatively determined in one and same membrane-type oxygen meter by using a membrane...
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4544455 |
Salt bridge liquid
Salt bridge liquid for use in potentiometric measurement of blood or a blood liquid. The salt bridge liquid contains Na + -ions and HCOO - -ions in substantially equimolar amounts, preferably in...
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4541901 |
Method and apparatus for zero calibration of oxygen-sensing polarographic devices
The calibration of a polarographic oxygen sensor (20) at zero oxygen concentration is accomplished by providing an oxygen-free liquid environment at the sensor active surface. This is accomplished...
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4539994 |
Method for transcutaneous measurement of a blood parameter and an electrochemical measuring electrode device for carrying out the method
In accordance with the principles for transcutaneous measurement of a blood parameter, such as the partial pressure of a blood gas, an electrochemical measuring electrode device (1) is applied to...
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4534356 |
Solid state transcutaneous blood gas sensors
Disclosed is a solid state oxygen sensor utilizing a noble metal first electrode and a silver/silver halide reference electrode and an oxygen permeable polymeric membrane electrolyte. Also...
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4533440 |
Method for continuous measurement of the sulfite/sulfate ratio
The redox potential is used as a measure of the ratio of sulfite and sulfate ions in a solution containing these ions. In one embodiment of the present invention a slip stream sample of a process...
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4514263 |
Apparatus and method for measuring the concentration of components in fluids
An apparatus and method for measuring the concentration of various components in a fluid sample. The apparatus comprises a chemically sensitive field effect transistor (CHEMFET) having a...
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4486272 |
Method of electrochemical measurement utilizing photochemical reaction and apparatus therefor
A light transmissible working electrode, an auxiliary electrode and a reference electrode are provided in an electrolytic cell having a light transmissive window. The working electrode comprises,...
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4479852 |
Method for determination of concentration of organic additive in plating bath
The concentration of an organic additive in a plating bath is determined by providing a polished and constant current density preplated rotating disc cathode, a reference electrode and anode in an...
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4477329 |
Apparatus for maintaining peroxide concentration
A modified alkaline peroxide pre-bond process for the surface treatment of titanium is useful as a practical production process. In this modified process, an exceptionally wide range of allowable...
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4477314 |
Method for determining sugar concentration
A method for determining the concentration of sugar in the presence of interfering foreign substances, by means of a test electrode with a membrane placed in front of it, the electrode being...
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4469562 |
Carbon dioxide sensor
An electrolyte anion exchange sensor having a first diffusion membrane is spaced apart from an anion exchange membrane to form a cathodic cell. A second diffusion membrane is spaced apart from the...
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4464230 |
Method of measuring oxygen using a membrane covered polarographic electrode
An oxygen analyzer which measures the level of dissolved oxygen in a liquid stream. The measuring process embodies chronoamperoemetry of pulsed potential voltammetry. The signal from the electrode...
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4459180 |
Method and means for compensating for IR voltage drop in electrochemical cells
Apparatus for compensating for the IR drop in a polarographic type electrochemical cell which utilizes an injected current for in situ calibration includes means operable for a brief period of the...
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4457808 |
Method and means for recalibrating electrochemical cells in situ
A method for in situ recalibration of a polarographic type electrochemical measuring system having a fourth electrode which includes adjusting the sensitivity of the system so that the measured...
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4454007 |
Ion-selective layered sensor and methods of making and using the same
A layered half cell comprising (a) an inert insulating substrate having coated thereon (b) a layer of conductive material having coated thereon (c) a layer of carbon dispersed in a dielectric...
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4436094 |
Monitor for continuous in vivo measurement of glucose concentration
A method for the continuous, in vivo measurement of glucose concentration in animal body fluids such as blood, comprises implanting in the body, in registry with the system for the body fluid, a...
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4424276 |
Method and apparatus for measuring the gaseous content of blood
Method and apparatus for determining the gaseous content of a diluent, such as determining the oxygen or carbon dioxide content of blood. A sample of the diluent whose gaseous content is to be...
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4419191 |
Electrochemical monitoring method
A modified alkaline peroxide pre-bond process for the surface treatment of titanium is useful as a practical production process. In this modified process, an exceptionally wide range of allowable...
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4376681 |
Method of measuring carbon dioxide in a liquid or gas
A carbon dioxide sensor for measuring dissolved carbon dioxide or carbon dioxide in gas is sterilizable with steam under pressure at a temperature of 120-130 degrees Celsius. The sensor comprises...
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4366033 |
Method for determining the concentration of sugar using an electrocatalytic sugar sensor
A method for determining the concentration of sugar in the presence of interfering foreign substances, particularly for determining glucose in a body fluid, by means of an electrocatalytic sugar...
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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...
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4353867 |
Method and apparatus for the determination of substances in biological solutions by differential pH measurement
A method and apparatus for the determination of the concentration of certain chemical substances such as glucose, urea, enzymes, etc. in biological solutions such as blood, serum, urine, using a...
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4287028 |
Electrochemical detection procedure for the determination of glucose in biological fluids
A method is disclosed for determining glucose whereby glucose is reacted with an aromatic reagent containing one or more nitro groups and the reaction is monitored at electrodes which measure the...
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4272328 |
Buffer overcoat for CO.sub.2 ion-selective electrodes
An ion-selective electrode for analyzing CO 2 concentration in a liquid sample comprises a support having thereon a metal zone, a metal halide zone, an electrolyte zone, a zone comprising a...
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4264328 |
Method for recording measured values in an automatically performed blood gas analysis
The measured values are calculated from the following equation: ##EQU1## in which X 1 , X i +1, X i +2 are three values of signals obtained from one electrode measured successively at equal...
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4230537 |
Discrete biochemical electrode system
A biochemical device and method for the determination of dissolved gases in solution is provided which employs a dry electrode/sample interface. Dissolved oxygen or other gas concentration in a...
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4207146 |
Process for testing gases in body fluids for partial pressure and to a testing device therefor
A testing device for the partial pressure testing of gases in body fluids comprises a test electrode having a platinum wire extending through a glass tubule arranged in a synthetic tube having a...
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4198851 |
Method and structure for detecting the concentration of oxygen in a substance
A field-effect transistor structure is utilized for detecting the concentration of oxygen in a substance to which the structure is exposed. The structure includes a semi-conductor substrate...
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4172765 |
Method for the quantitative determination of alpha-amylase
This invention relates to a method and apparatus for rapid quantitative determination of α-amylase in aqueous samples such as blood serum, etc. The method comprises a flow-through of the sample...
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4171246 |
Method for determining ionic activity of components of liquid drops
A device and a method are disclosed for determining ion activity in liquids by the use of electrodes, particularly comprising an electrode mounting frame and transport means for promoting ionic...
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4170523 |
Method for checking isolation between titration and electrochemical measuring systems of a chemical analyzer
A method of checking the electrical isolation provided by a gas permeable membrane for a carbon dioxide sensor in an analyzer for simultaneously measuring the carbon dioxide and chloride content of...
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4168220 |
Method for detecting the fouling of a membrane covered electrochemical cell
In a polarographic cell of the type which avoids depletion of the species being measured in the sample, the fouling of the membrane covering of the cell is detected by utilizing an electrode which...
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4145255 |
Method and device for the detection of phenol and related compounds
Phenol or a phenol related compound is detected in an electrochemical cell comprising a cathodic compartment containing a cathode in an electrolyte solution containing ferrocyanide ion and an...
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4127448 |
Amperometric-non-enzymatic method of determining sugars and other polyhydroxy compounds
A method for determining hydrogen peroxide, sugars and other polyhydroxy compounds in blood serum, urine and aqueous solutions by direct electrochemical oxidation in aqueous alkaline medium with a...
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4120657 |
Process of and equipment for the analysis of liquid samples by titration
The invention relates to a process of and equipment for a selective, quick and accurate analysis of liquid samples. According to the process of the invention a liquid or a gas sample absorbed by a...
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4119498 |
Monocrystalline metal electrode and method of use
An improved metal electrode for the determination of pH, P O s or P CO s in liquids is disclosed. The improved electrode consists of a metal sensor (e.g., antimony) in a holder characterized in...
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RE29703 |
Non-invasively measuring arterial oxygen tension
Oxygen tension is measured in the palpebral conjuctiva and is converted to arterial oxygen tension by applying a conversion factor thereto. A polarographic oxygen sensor on the outer surface of a...
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4076596 |
Apparatus for electrolytically determining a species in a fluid and method of use
An electrolytic cell for measuring the concentration of a species such as oxygen is constructed by depositing closely spaced interleaved inert electrode surfaces on the surface of an insulating...
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4042465 |
Measurement of oxygen in a fluid sample and apparatus therefor
An electrical system for automatically measuring, computing and indicating the oxygen content in a sample of fluid, using a galvanic cell that absorbs and consumes the oxygen from the sample,...
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4036704 |
Liquid chromatographical method
A separation column for separating and developing a sample to be analyzed is connected to a pump for feeding an eluting solution at an end of the separation column. A means for introducing the...
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4019861 |
Method and apparatus for measurement of CO.sub.2 and chloride in body fluids
An improved apparatus and method for detecting CO 2 and Cl - in body fluids, such as whole blood, blood serum and plasma, etc. A reagent and a known amount of the sample to be tested react in a...
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3962046 |
Method and apparatus for testing properties of liquids
Apparatus for measuring the dissolved oxygen content of water comprises an open-ended duct immersed in the water in an upright position, an oxygen-detecting probe in the lower end portion of the...
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3929588 |
Method of and apparatus for determining the oxygen content of blood
A method of and an apparatus for quickly and reliably analyzing fresh blood to accurately determine its partial oxygen pressure (pO 2 ) with the analysis being displayed as a digital readout on a...
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3922205 |
Portable polarographic analyzer and quick polarographic determinations
A special purpose portable polarographic instrument and method for the rapid repetitive quantitative determination of polarographically reactive species in aqueous solution utilizing a sample cell...
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