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4133736 Apparatus for determining an oxygen content  
An apparatus for determining oxygen content in a sealed container is disclosed. The apparatus comprises a sampling tube having a sampling zone which is provided with a pumping means, a change-over...
4128468 Electrode structures  
An ion sensitive electrode structure employing concentrically arranged inner and outer tubular members employs a porous plug to seal the annular space between the tubular members and to enable...
4126531 Sensor with annular pressure compensating means  
The present invention is directed to a means for compensating for pressure changes in sensing devices. To assure accurate measurements with sensing devices immersed in a medium, it is necessary to...
4119498 Monocrystalline metal electrode and method of use  
An improved metal electrode for the determination of pH, POs or PCOs in liquids is disclosed. The improved electrode consists of a metal sensor (e.g., antimony) in a holder characterized in that...
4106995 Microorganism growth inhibitor device  
There is disclosed a device which inhibits the growth of microorganisms on the surface of a primary sensor element, such as the oxygen permeable membrane of a dissolved oxygen cell or the...
4105525 Internal standard electrolyte for ammonia sensor  
An ammonia electrode having an internal standard electrolyte solution comprising a saturated aqueous solution of 5,5'-Nitrilodibarbituric acid ammonium salt.
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...
4100048 Polarographic cell  
A polarographic cell for measuring partial pressure of oxygen in a fluid in which the detector electrode and the reference electrode are immersed in an electrolyte at least partially absorbed in a...
4096047 Electroanalytical transducers  
Electroanalytic transducers for electrochemical analysis of chemical substances are disclosed. The transducers are of the type which include electrodes contacting an electrolyte solution. In...
4094305 Method and an arrangement for continuously measuring the partial pressure of a gas in a sample  
A method and an arrangement for continuously measuring the partial pressure of a gas in a sample, particularly of oxygen dissolved in blood flowing through muscle tissue which is covered by a skin...
4092844 Hydrogen probe with limited active area  
An insertion-type hydrogen probe with a defined active length is described. The probe is formed of a thin-walled, hydrogen-permeable material, and a hydrogen-impermeable liner inside the probe...
4092233 Membrane apparatus  
An improved apparatus is described wherein a semi-permeable membrane is supported against a convex surface and wherein the likelihood of damage to such membrane during mounting and use is...
4092232 H2 S Direct gas sensor  
A combined specific ion and reference electrode structure having an air gap, gas permeable membrane and in which the active, conducting solution has a surface tension and boiling point which are...
4078981 CO2 interference free O2 electrode  
An improved electrode for use in oxygen determination is disclosed. Interference from carbon dioxide is eliminated by combining an improved electrolyte with means for permitting rapid electrolyte...
4077861 Polarographic sensor  
An apparatus and method for polarographically determining the amount of oxygen in a gaseous mixture containing interfering reducible gases such as nitrous oxide is disclosed. The invention has...
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...
4073713 Membrane for enzyme electrodes  
A laminated membrane for use with an enzyme electrode without the need for use of a compensating electrode. The laminated membrane comprises a layer of essentially homogeneous material such as...
4062750 Thin film electrochemical electrode and cell  
A thin film polarographic oxygen sensor, in which a number of thin film microcathodes are deposited in holes in a thin film layer of silicon dioxide formed on a silicon substrate. A single thin...
4058447 Electrochemical measuring electrode  
An electrode for polarographic measurement of the partial pressure of oxygen in gases or solutions, comprising a cathode in contact with and outwardly shielded by a gas permeable membrane, a...
4057478 Electrochemical gas monitor  
An electrochemical detection system is disclosed for measuring the amount of carbon monoxide or similar oxidizable gases present in a gas phase mixture wherein the gas phase mixture is brought...
4051006 Portable electrochemical cell structure  
An electrochemical detection cell particularly suited for portable applications because of its small size and low cost. An enclosure is provided having two membrane surfaces. Electrodes are...
4045297 Triglycerides determination method  
A method of determining triglycerides in biological fluids which comprises reacting a biological fluid sample with a lipolytic enzyme to liberate free glycerol, reacting said free glycerol with a...
4041933 Electrode for polarographic measurements in physiological media  
An electrode for effecting polarographic measurements in physiological media, in particular an oxygen electrode for the measurement of the partial pressure or tension of the oxygen in the human or...
4025308 Method and apparatus for monitoring low concentrations of ions in a flowing fluid  
A method and apparatus for monitoring low concentrations of certain ions present in a flowing fluid is described in which an isokinetic sample is passed through an electroseparative cell wherein,...
4024042 Enzyme electrode  
The invention relates to an enzyme electrode which can be sterilized and regenerated and which has a sensitive surface and an enzyme in contact therewith. A semipermeable membrane is arranged at a...
4020830 Selective chemical sensitive FET transducers  
A chemical sensitive field-effect transistor transducer capable of selectively detecting and measuring chemical properties of substances to which the transducer is exposed. The transducer includes...
4017374 Electrochemical measuring electrode  
Electrochemical measuring electrodes often have a thin foil-shaped membrane, e.g. made of a plastic foil, which is arranged at one end of a cylindrical portion of the electrode and maintained in...
4006061 Lactate dehydrogenase determination method  
A method of determining lactate dehydrogenase activity in biological fluids comprising reacting a biological fluid sample with a coupled enzyme series in an oxygenated aqueous solution containing...
4005002 Apparatus for measuring substrate concentrations  
The concentration of substrates of enzyme reactions is measured by determining the current produced at a platinum or gold electrode by oxidizing an acceptor utilizing a measuring device comprising...
4003705 Analysis apparatus and method of measuring rate of change of electrolyte pH  
Apparatus for measuring carbon dioxide and chloride in blood. A blood sample is reacted with acid in a sample container to release carbon dioxide, a portion of which diffuses through a...
3999284 Method for making a polarographic sensing means  
A catheter system for blood gas monitoring and the method of making same comprising a polarographic sensing means having a body, first and second conductors supported by the body and each...
3998717 Glass electrode for membrane diffusion analysis of gases  
This invention relates to a glass electrode structure. More specifically, the present invention relates to a glass electrode having a curved sensor tip for use in determining gas in an...
3998212 Electrode for percutaneous polarographic measurements  
An electrode for percutaneous polarographic measurements and, in particular, an oxygen electrode for the percutaneous measurement of the partial pressure or tension of oxygen in human or animal...
3997420 Automatic analyzer  
An apparatus for automatically performing blood chemistry analyses and in particular the determination of the pH, PCO2 and PO2 of blood. The apparatus employs a flow cell having pH, PCO2 and PO2...
3997419 Dissolved oxygen cell  
An electrochemical device for sensing the concentration of dissolved oxygen in aqueous liquids is described. The device has a housing with a projecting boss that supports an assembly of the cell...
3988233 Apparatus for measuring dissolved gases in a fluid medium  
Apparatus for measuring dissolved gases in a fluid medium includes a tubular member which is inserted in a pipe line through which the fluid medium flows. This tubular member thus becomes a part...
3985633 Device for the polarographic measurement of oxygen pressure  
A platinum oxygen-pressure measuring electrode is connected with a reference electrode. An indicating device for indicating the oxygen pressure is connected with both of the electrodes, and an...
3974040 Controls for maintaining low nitrogen oxides content in internal combustion engine exhaust gases  
Control system and apparatus for measuring and monitoring the nitrogen oxides content of internal combustion engine exhaust gases. The exhaust gases are contacted with the reducing electrode of a...
3966580 Novel protein-immobilizing hydrophobic polymeric membrane, process for producing same and apparatus employing same  
A protein-immobilizing hydrophobic polymeric membrane comprising an organic, hydrophobic polymeric substrate with a specific protein reactive group pendant therefrom in preselected concentration...
3966579 Apparatus for measuring alcohol concentrations  
Alcohol concentrations present in a gaseous breath sample are monitored by measuring the magnitude of the short circuit current passing through the external circuit between the anode and cathode...
3959107 Combination electrode  
An ion selective combination is formed by creating a measuring electrode from an elongated tube whose wall is made with a depression along its length. That wall depression is covered with a...
3957613 Miniature probe having multifunctional electrodes for sensing ions and gases  
A miniature probe for simultaneously sensing ion concentrations and partial pressures of gases in a sample comprises plural sensing electrode systems at least one of which is surrounded by an...
3948745 Enzyme electrode  
An electrode assembly for amperometric analysis of amperometrically inactive material including an enzyme for converting the inactive material to one which is amperometrically active. The enzyme...
3948746 Dissolved oxygen probe  
A probe immersible in liquid having oxygen dissolved therein and adapted to continuously and accurately measure the oxygen concentration. The probe includes a noble metal measuring electrode, a...
3930493 Intravascular liquid velocity sensing method using a polarographic electrode  
The linear flow rate of a liquid containing dissolved oxygen, such as blood, can be determined by means of an electrode assembly having exposed to the liquid a relatively large polarographically...
3929603 Electrolytic sensor with pressure compensating means  
The present invention is directed to a means for compensating for pressure changes in sensing devices. It is important that any sensing means immersed in a medium have internal and external...
3929605 Apparatus for quickly evaluating gases dissolved in blood  
A sensing apparatus is disclosed for measuring the concentration of gas in a blood sample. The sensor includes a temperature measuring surface centrally enclosing a sensor head for measuring the...
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 (pO2) with the analysis being displayed as a digital readout on a...
3926766 Miniature probe containing multifunctional electrochemical sensing electrodes  
A miniature probe contains multifunctional electrochemical electrodes which measure the hydrogen ion activity or pH of samples. One of these electrodes is contained within a carbon dioxide sensor...
3919067 Voltammetric oxygen sensor  
A voltammetric oxygen sensor is described which includes a pair of spaced apart and electrically insulated noble metal wire electrodes, and a reference electrode associated with the pair of...