| Patent Number |
Title Of Patent |
Date Issued |
| 4990236 |
Thin film moisture sensing element |
February 5, 1991 |
| A solid state, thin film moisture sensing element is disclosed. The sensing element is fabricated by thin film deposition of at least a pair of two layer electrodes on an insulating surface. The active surface of the element is then coated with a layer of hygroscopic material and placed |
| 4776942 |
Electrochemical sensor |
October 11, 1988 |
| An improved sensor for dissolved oxygen measurement comprising a body having an electrolyte reservoir and electrolyte contained therein and an opening for communication between the exterior of the body and the reservoir and an anode and cathode concentrically disposed in the body adj |
| 4707244 |
Solid state sensor element |
November 17, 1987 |
| A solid state sensing element comprising a nonporous, structurally stable, electrically insulating substrate on which is disposed spaced apart pairs of electrodes for contact with moisture. A hygroscopic electrolytic material is located in close proximity to the electrodes as by coating |
| 4655900 |
Method for treating electrodes and improved electrochemical cell |
April 7, 1987 |
| An improved electrochemical cell is described which comprises at least one electrode having increased signal strength achieved by treating at least the working surface of the electrode with a coating of a polytetrafluoroethylene and a catalyst metal selected from the group consisting |
| 4575410 |
Solid state electrode system for measuring pH |
March 11, 1986 |
| An improved solid state electrode system for measuring the pH of fluids at temperatures as high or even higher than that corresponding to the critical point of water (374.2.degree. C.). A stabilized metal oxide based ceramic member having a predetermined thickness is coupled to a first |
| 4485001 |
Sterilizable pH electrode and method for producing the same |
November 27, 1984 |
| A pH electrode which is capable of withstanding repeated exposures to sterilizing temperatures. An electrode body having a pH sensing member is at least partially filled with a bed of electrochemically inert particles. After an internal reference is inserted into the particle bed, the be |
| 4455213 |
Pressure equalization system for membrane type amperometric sensors |
June 19, 1984 |
| A membrane type amperometric gas sensor is provided with a pressure equalization passage between the exterior and interior of the cell in which the electrodes are located. Cell fluids move into and out of the passage as necessary to maintain the pressure inside the cell substantially |
| 4372915 |
Fluorescent sulfur dioxide analyzer having an improved sulfur dioxide generator |
February 8, 1983 |
| A fluorescent sulfur dioxide analyzer that includes a generator for producing a standard gas of known sulfur dioxide content. A source of ultraviolet radiation illuminates the interior of a reaction chamber in which an oxygen containing gas is passed over a deposit of sulfur. During |
| 4328082 |
Solid state ion-sensitive electrode and method of making said electrode |
May 4, 1982 |
| A solid state ion-sensitive measuring electrode is disclosed in which a filler solution comprising sodium silicate is provided between an outer glass membrane of the electrode and an internal metallic wire which serves as a conductor from the electrode to a meter. The filler solution is |
| 4325912 |
Carbon monoxide detection apparatus |
April 20, 1982 |
| A carbon monoxide detection apparatus and process are disclosed in which the amount of carbon monoxide is measured by oxidizing it and measuring the heat of oxidation. To accomplish this platinum oxide is used as the catalyst and an operating temperature is maintained at which oxidation |
| 4272248 |
Nitric oxide interference free sulfur dioxide fluorescence analyzer |
June 9, 1981 |
| In a sulfur dioxide fluorescence analyzer, a method and apparatus for eliminating the fluorescence effects of nitric oxide is disclosed wherein a sample gas is mixed with a diluent which substantially quenches nitric oxide fluorescence. |
| 4268370 |
High temperature, CO.sub.2 interference free, electrochemical O.sub.2 sensor |
May 19, 1981 |
| An electrochemical sensor for determining the O.sub.2 content of a fluid characterized in that the electrolyte employed therein is selected from a group consisting of amino alcohols having 2 to 12 carbon atoms, morpholine, and mixtures thereof. Optimally, the electrolyte can further |
| 4078981 |
CO.sub.2 interference free O.sub.2 electrode |
March 14, 1978 |
| 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 movement into and out of the space between the cathode and the membrane covering the cathode |
| 4002547 |
Electrochemical reference electrode |
January 11, 1977 |
| An electrochemical reference electrode for use in ion potential measurements of solutions. The liquid junction structure of the electrode comprises a hydrophobic polymer having a suitable salt distributed therethrough and held in place to prevent leaching by a filamentary structure o |
| 3934991 |
Nitric oxide analysis and scrubber therefor |
January 27, 1976 |
| A method of analyzing nitric oxide (NO) in a gas stream containing nitrogen dioxide (NO.sub.2) and a scrubber apparatus for selectively removing nitrogen dioxide from a gas stream containing nitric oxide. The scrubber apparatus comprises a container having an inlet port for the gas strea |
