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4450842 Solid state reference electrode  
In the reference electrode construction disclosed herein, silver and silver chloride particles are incorporated in a mixture including a fusible glass frit. After being printed on a suitable...
4450064 Electrochemical gas sensor and method for producing the same  
An improved method for producing an electrode assembly for use in electrochemical gas sensors. A plurality of conductors are attached to one surface of a generally circular electrode blank. These...
4446000 Oxygen sensor and method for making same  
A readily adjustable oxygen sensor utilizing a wooden plug as the oxygen-limiting porous diffusion barrier.
4444646 Membrane cap assembly for oxygen monitors  
An improved membrane cap assembly is provided for polaragraphic oxygen sensors in which a preassembled cap is provided with a membrane mounted for receiving the electrodes thereagainst when the...
4442841 Electrode for living bodies  
An electrode for living bodies consisting of a fine metal wire at least part of the surface of which is directly coated with a porous membrane having fine pores of an average pore diameter of...
4441979 Nutating probe for gas analysis  
A probe immersible in process water or wastewater having oxygen, chlorine or another gas dissolved therein and adapted to continuously and accurately measure the concentration of the gas. The...
4440620 Measuring electrode device  
A measuring electrode device comprises a pH electrode arranged within an outer casing and having a pH sensitive member in contact with an electrolyte housed in the outer casing. The electrolyte...
4437969 Offset-gate chemical-sensitive field-effect transistors (OG-CHEMFETS) with electrolytically-programmable selectivity  
A selective chemosensitive microelectronic transducer is provided for the detection and measurement of chemical properties, by engineering a field-effect transistor such that source 6 and drain 7...
4436610 Apparatus for measuring electrochemical activity  
Apparatus is disclosed for measuring the electrochemical activity of a liquid, for example, the hydrogen ion activity or pH value of blood. A disposable cartridge includes spaced indicating and...
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...
4435268 Oxygen sensing cell  
An improved oxygen sensing cell, especially of the polarographic type, is intended for use primarily in a gaseous environment. The cell has a cathode located at the bottom of the cell body. The...
4432366 Reference electrode catheter  
A reference electrode catheter for use for in vivo measurement of body fluids. The catheter includes a small diameter cylindrical tube having a reference electrode assembly disposed on the distal...
4425918 Membrane retainer arrangement for physiological sensing units  
Disclosed herein is a retainer arrangement for applying a membrane to a physiological sensing unit for the transcutaneous determination of the magnitude of physiological quantitites, particularly...
4420564 Blood sugar analyzer having fixed enzyme membrane sensor  
A blood sugar analyzing apparatus has a reaction cell which houses a fixed enzyme membrane sensor and a measuring electrode which receives a blood specimen which causes a chemical reaction between...
4419210 Polarographic electrode  
An improved 3-pole membrane electrode for polarographic measurements in which an auxiliary electrode is defined having an arc which is generated by rotation about the center point of a disc-shaped...
4410409 Amperometric gas sensor, cathode assembly therefor and method of making said cathode assembly  
An improved electrode assembly for use in amperometric gas sensors. A portion of the interior of the electrode assembly that is adjacent to the electrode is filled with an electrochemically inert...
4407291 Transcutaneous blood oxygen measuring device  
A transcutaneous blood oxygen measuring device is disclosed for the noninvasive measurement of oxygen partial pressure in arterial blood which includes a cathode surrounded by an anode held...
4406770 Gas sensor  
A gas sensor cell assembly has planar electrodes separated by a planar hydrophilic wick which extends through the electrode into an electrolyte expansion chamber where it contacts an electrolyte....
4401547 Polarographic apparatus with detachable sample chamber for measuring blood gases  
A test apparatus for measuring blood characteristics comprises a measuring head having a measuring electrode and a reference electrode arranged in spaced relationship and a closure membrane...
4400242 Electrochemical method of determining oxygen, halothane and nitrous oxide  
In a method of electrochemically sensing the presence of O2, N2 O and halothane in a fluid, a gold or platinum electrode and a silver electrode are exposed to the fluid through a permeable...
4400258 Measuring device for facilitating the electrical measurement of a substance  
A measuring device for facilitating the electro-chemical measurement of a substance such as a gas comprises a holder ring which has an opening therethrough with an inwardly extending annular...
RE31299 Ion-selective electrode device for polarographic measurement of oxygen  
An ion-selective electrode device for measuring oxygen concentrations comprises a noble metal reduction electrode connected to a voltage source; a reference electrode connected to said reduction...
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...
4390405 Oxygen electrode and method for preparation thereof  
An oxygen electrode adapted for use for polarographic, galvanometric or amperometric analyses, that is resistant to poisoning and effective for accurate, reproducible current and voltage...
4388166 Electrochemical measuring apparatus provided with an enzyme electrode  
An electrochemical measuring apparatus which essemtially comprises an asymmetric semipermeable membrane mounted on an immobilized enzyme membrane of an enzyme electrode, said asymmetric...
4379029 Method of measuring metallic cation and water transport numbers for cation exchange hydraulically impermeable membranes and test cell therefor  
An electrolytic membrane transport cell adaptable to experimental use for the purpose of accurately measuring simultaneously cation transport and water transport numbers (mol/Faraday) under...
4377446 Carbon dioxide measurement  
Carbon dioxide in the presence of oxygen is sensed by passage of the gas mixture through a layer of polymeric material and through a first, porous, working electrode in contact with a layer of...
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...
4367133 Electrochemical gas analyzer  
An electrochemical cell (10) having a structural organization that permits it to operate as either a galvanic or polarographic cell. The structural organization includes an electrolyte reservoir...
4359054 Retainer arrangement and method for applying a membrane to a physiological sensing unit  
Disclosed herein are a method and a retainer arrangement for applying a membrane to a physiological sensing unit for the transcutaneous determination of the magnitude of physiological quantities,...
4349426 Anion sensing electrode  
A sensing membrane is fixed to one end of a tube comprising polyvinyl chloride. An aqueous sodium chloride solution is contained in the tube, and is in contact with an internal electrode wire. The...
4340457 Ion selective electrodes  
An ion selective electrode capable of production in miniaturized form suitable for in vivo monitoring is produced by coating a metal-metal salt half cell with a layer of hydrophilic material...
4338174 Electrochemical sensor with temperature compensation means  
A disposable gas sensor, such as for monitoring pO2 in blood or administered gases, includes a housing, a passageway therein for blood or gas, a membrane-anode-cathode polarographic assembly, and...
4338127 Addition and measurement of gases dissolved in molten metals  
Method and apparatus for measuring gases dissolved in molten metal. Also disclosed are method and apparatus for dissolving gases in molten metal and a method of forming a gas permeable but molten...
4333473 Apparatus for the cutaneous determination of the oxygen partial pressure in blood  
An apparatus for the simultaneous determination of the cutaneous blood gas concentration and of the blood gas availability for the correction of physiologically caused errors of the measured value...
4325797 Membrane mounting method and membrane-enclosed amperometric cell  
A method of mounting and securing a membrane of polymer film on an amperometric cell that has a cylindrical cell end provided with an electrolyte-bearing sensor face; the holding member is a...
4324257 Device for the transcutaneous measurement of the partial oxygen pressure in blood  
A device for the transcutaneous measurement of the partial oxygen pressure in blood, comprising a measuring head which includes a measuring cell of the Clark-type which is surrounded by one or...
4324256 Electrode device  
An electrode device for transcutaneous PCO2 measurement with a pH-sensitive measuring electrode behind a CO2 -permeable membrane, a reference electrode, and an electrical heating device for...
4322215 Method 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...
4312332 Oxygen sensing  
Oxygen sensing as disclosed herein is performed by applying a solid state, self-heating sensor to the patient's skin. A noble metal cathode and a thick-film reference electrode are provided on the...
4311151 Oxygen measuring electrode assembly  
A polarographic electrode assembly for transcutaneous measurement of partial oxygen pressure in arterial blood comprising an anode, a cathode which has a thin ring surface or a circularly-bounded...
4306877 Optical measurement of concentration  
The concentration of a substance of interest is measured by exposing a peable-membrane face of an indicator chamber containing an indicator to the substance, monochromator radiation being incident...
4299669 Method for determining the concentration of an L-amino acid in fermentation  
Electrochemical method for determining the concentration of a carbon source and L-amino acid in a fermentation medium or cultured broth by contacting a microbial electrode consisting of an...
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,...
4293307 Method and apparatus for analyzing liquid  
Method and apparatus for analyzing a liquid such as blood, and in particular analyzing certain constituents such as potassium or calcium ions, or dissolved gases comprising withdrawing the...
4293399 Device for detecting and measuring the concentration of gaseous hydrogen dissolved in a fluid  
Discloses is an improved device to facilitate detecting and measuring the concentration of gaseous hydrogen dissolved in a fluid. A polymeric membrane is in contact with the fluid and permeable to...
4288544 Method and apparatus for measuring microorganism activity  
The microbial activity in a liquid medium is determined by measuring the electric current values or potential values generated by the microorganisms. Also disclosed herein is apparatus for...
4280505 Fixation ring for transcutaneous gas sensor probe  
A fixation ring for a transcutaneous gas sensor probe adapted to be removably mounted on the probe with a bore in the ring communicating with the electrodes of the probe. The fixation ring...
4274418 Electrochemical measuring device  
The invention relates to an electrochemical measuring device for transcutaneous measurement of arterial partial gas pressure, especially partial pressure of oxygen or carbon dioxide. The measuring...
4273134 Fixation ring assembly and method of assembling a sensor head  
A method of assembling a sensor head and permeable membrane with encapsulated electrolyte. A disposable fixation ring is part of a similarly disposable fixation ring assembly, the latter of which...