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| Number | Title | Issue Date |
| 4443791 | Self-compensating gas detection apparatus Alarm-indicating gas detection apparatus including a first semiconductor gas-sensing element having one electrical property which varies significantly with increasing concentrations of a first undesirable gas and less significantly with increasing concent... | 04/17/1984 |
| 4420722 | Testing semiconductor furnaces for heavy metal contamination A technique for testing for heavy metal contamination in semiconductor processing furnaces includes use of a chip having a plurality of PN- junctions, at least one of which is completely isolated from the sides of the chip. The chip is manufactured to exh... | 12/13/1983 |
| 4414839 | Gas sensing apparatus and method A sensing apparatus and method for qualitatively and quantitatively analyzing small amounts of selected oxidizable gases in a carrier gas including the associated electronic circuitry is described. The apparatus preferably includes two semi-conductor type... | 11/15/1983 |
| 4410632 | Gas sensing apparatus and method A sensing apparatus and method for qualitatively and quantitatively analyzing small amounts of selected oxidizable gases in a carrier gas including the associated electronic circuitry is described. The apparatus preferably includes two semi-conductor type... | 10/18/1983 |
| 4399684 | Gas measurement method A gas measurement method for metal-oxide gas sensors. The sensors are thermally cycled by sequential heating and cooling. It has been found that a continuous, concentration-dependent, unique signature for different gases is produced during thermal cycling... | 08/23/1983 |
| 4396899 | Platinum thin film resistance element and production method therefor A platinum thin film is formed by sputtering platinum onto an insulating substrate and heat aging the platinum thin film in a stairstep manner. A kerf is formed in the platinum thin film to produce a desired resistance, and a metal oxide semiconductor fil... | 08/02/1983 |
| 4378691 | Multi-functional sensor A multi-functional sensor capable of sensing the humidity and the concentration of reducing gases in the surrounding atmosphere with a single sensing element of p-type metal-oxide ceramic semiconductor is provided. When the ambient temperature is lower th... | 04/05/1983 |
| 4377944 | Integrated gas sensitive unit comprising a gas sensitive semiconductor element and a resistor for gas concentration measurement For use in a gas sensor, an integrated gas sensitive unit comprises, on a single principal surface, a gas sensitive semiconductor element and a first resistor member connected to the element in series for deriving an electrical signal from the element. Bo... | 03/29/1983 |
| 4351181 | Linear, gas to voltage transducer circuit In a gas sensor circuit having a semiconductor gas measuring sensor such as a Taguchi, a variable gain transconductance amplifier is interconnected between the gas measuring sensor and a conventional differential amplifier so that the circuit's output vol... | 09/28/1982 |
| 4338281 | Thin film semiconductor gas sensor having an integrated heating element A thin film semiconductor gas sensor including a metal oxide semiconductor sensor layer whose electrical resistance changes in dependence upon the nature and concentration of a gas being detected and having a heating element integrated therewith is improv... | 07/06/1982 |
| 4322968 | Temperature compensated plug-in type oxygen detector for exhaust gas A plug-in type oxygen detector for detecting oxygen contained in exhaust gas is disclosed which comprises a series connected, sintered N and P type oxide semiconductors which have temperature dependencies in the same direction and respond to a partial pre... | 04/06/1982 |
| 4313338 | Gas sensing device A gas sensing device comprises a gas sensing element comprising a gas-sensitie resistive film formed of an aggregate of ultrafine particles of a suitable material deposited on the surface of a substrate of an electrical insulator formed with electrodes.... | 02/02/1982 |
| 4302530 | Method for making substance-sensitive electrical structures by processing substance-sensitive photoresist material Disclosed is a substance-sensitive semiconductor and a method for making the same, wherein a substance-sensitive material is combined with photoresist material and applied to an electronic device structure. The substance-sensitive material may be applied ... | 11/24/1981 |
| 4256985 | Specificity of semiconductor gas sensor A gas sensor unit designed to indicate the presence of hydrocarbon vapors but be insensitive to carbon monoxide. The unit comprises two TGS sensors, one covered by a semi-permeable membrane and the other uncovered; the uncovered sensor responds to both cr... | 03/17/1981 |
| 4224280 | Carbon monoxide detecting device A carbon monoxide detecting device which exhibits a stepwise change in film current over a preselected range in carbon monoxide concentration is disclosed. According to the present invention, in one embodiment, a first film predominantly of stannic oxide ... | 09/23/1980 |
| 4221827 | Method of manufacturing a gas sensor A system for detecting carbon monoxide, even in the presence of methane, using a catalytic sensor material having a perovskite crystal structure and a composition where A is a rare earth metal; B is an alkaline metal; C is a metal from the group consistin... | 09/09/1980 |
| 4206647 | Titania thermistor and method of fabricating A high temperature thermistor and its method of fabrication are disclosed. The thermistor is fabricated from titanium dioxide ceramic forming material and is fabricated to achieve a high degree of densification approaching 100% of theoretical density. At ... | 06/10/1980 |
| 4203946 | Ozone detecting element A detecting element for sensing the presence of higher than normal concentrations of ozone in air at ambient temperatures and pressures. The element is formed of a "lower" oxide of a semiconductor having a variable valence. In the presence of ozone, two f... | 05/20/1980 |
| 4198850 | Gas sensors In a gas-sensitive resistor of the metal oxide type, the sensitive body is a single crystal of zinc oxide. Such a sensor has particular application in the testing of oxygen-containing atmospheres for the presence of carbon monoxide.... | 04/22/1980 |
| 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 material having one doping polarity, a pair of spaced apart diffu... | 04/22/1980 |
| 4185491 | Gas monitors A gas sensor incorporating a sensor element of the heated semi-conductor type has a heater for the element connectible to a variable power source, the output of which is responsive to the concentration of gas under test.... | 01/29/1980 |
| 4178793 | Apparatus for oxygen sensor impedance measurement A vehicle engine exhaust mounted oxygen sensor of the type producing an internally generated signal voltage and having a variable internal impedance is connected in series with a reference impedance and a semiconductor switch, the semiconductor switch hav... | 12/18/1979 |
| 4175422 | Gas monitors A gas sensor having a sensitive element of semi conductor type, the sensor being contained within an enclosure adapted to permit gas to come into contact with the element and incorporating means for maintaining adjacent the element, a substantially consta... | 11/27/1979 |
| 4169369 | Method and thin film semiconductor sensor for detecting NOx The concentration of NOx in a gaseous mixture is measured using a solid state sensor comprising a surface thin film of semiconductive material. In a preferred embodiment, the thin film semiconductor comprises tin oxide having an oxygen to tin a... | 10/02/1979 |
| 4166380 | Quantitative measuring system for combustible gas with audible tick rate The instrument uses a semiconductor gas sensor element energized with a regulated voltage source and placed in the atmosphere to be tested to generate a signal representative of the concentration of natural gas in the air. A meter displays the signal to d... | 09/04/1979 |
| 4161875 | Apparatus for measuring the alcohol percentage in the breath of an examinee Apparatus for measuring the alcohol percentage in the breath of a person by blowing the breath into an airtight chamber enclosing a gas detector of the type of which the electric resistance changes upon exposure to alcohol vapor. The breath is introduced ... | 07/24/1979 |
| 4142400 | Nitrogen dioxide sensing element and method of sensing the presence of nitrogen dioxide An element for sensing the presence of nitrogen dioxide gas in the environment. The element comprises a film of a pyrolyzed polyaromatic polymer having semi-conductive properties which is mounted on an electrically non-conductive base. Electrical leads ar... | 03/06/1979 |
| 4111034 | Apparatus for monitoring the solvent content of air An apparatus for monitoring the solvent content of air, especially for detecting the presence of perchloroethylene or trichloroethylene in association with a drycleaning plant, for measuring the concentration of the solvent and/or for triggering an alarm ... | 09/05/1978 |
| 4112356 | Semiconductor gas detector circuit In a gas detector circuit a semiconductive detector, such as a Taguchi detector, is disposed in gas communication with the gas to be detected. The detector has a sensing resistor incorporated therein with a value of resistance that changes in accordance w... | 09/05/1978 |
| 4103227 | Ion-controlled diode Disclosed is an ion-controlled device for providing an electrical indication of a specific ion concentration in a fluid. An ion-sensitive membrane is placed over the junction of a gate controlled diode whose impedance is being measured. An external refere... | 07/25/1978 |
| 4063446 | Method of and apparatus for automatically detecting traces of organic solvent vapors in air Method and apparatus for detecting minute traces of a gas in the PPB range (μg.m-3) by pumping a gas mixture through a non-specific gas detector measuring cell and displaying and/or recording the signals generated by the measuring cell. For ze... | 12/20/1977 |
| 4058368 | Hydrogen detector A device for the detection of hydrogen comprising a semiconductor, a metal electrode and an insulator situated between the semiconductor and the electrode. The metal electrode is made of palladium, nickel, platinum or an alloy containing at least 20% pall... | 11/15/1977 |
| 4033169 | Hydrocarbon concentration sensor for use in engine exhaust gas A sensor having an n-type oxide semiconductor layer and a p-type oxide semiconductor layer spaced from and electrically connected in series with each other and two fixed resistors connected in series with each other, wherein the two semiconductor layers a... | 07/05/1977 |
| 4011745 | Semiconductor sensors A semiconductor sensor adapted to detect with a high degree of sensitivity small magnitudes of a mechanical force, presence of traces of a gas or light. The sensor includes a high energy gap (i.e., ~ 1.0 electron volts) semiconductor wafer. Mechanical for... | 03/15/1977 |
| 4001757 | Method for detecting a reducing material in a gas phase A method for detecting the presence of a reducing material in a gas phase which involves heating a gas sensor, which has, as a major part, a partially dehydrated iron hydroxide having electrodes applied thereto, to a temperature less than 500° C and brin... | 01/04/1977 |
| 4001756 | Measuring cell for determining oxygen concentrations in a gas mixture Measuring cell for determining oxygen concentrations in a gas mixture, which cell comprises two elements made of a semiconductive oxidic material which is doped so as to have n-type and p-type conductivity respectively and which are separated by a metal l... | 01/04/1977 |
| 3999947 | Reducing gas sensor and a method of producing the same This invention provides a reducing gas sensor which has a gas sensitive element of γ-ferric oxide (γ-Fe2 O3), a pair of electrodes and a heater element. The γ-ferric oxide is in the form of a thin film, a plate or a thin surface l... | 12/28/1976 |
| 3999122 | Semiconductor sensing device for fluids A semiconductor sensor for fluids comprised of a body composed of an inorganic semiconductor material which is provided with a drain and source zone interconnected by a channel zone and including a layer of a reactive organic material capable of forming a... | 12/21/1976 |
| 3997837 | Gas analysis device In a system for analyzing a gas mixture and including a semiconductor gas measuring sensor and an indicating element, a differential amplifier is connected in series between the sensor and the indicating element.... | 12/14/1976 |
| 3932807 | Gas sensitive devices In a system for detecting a gas or vapour by virtue of its effect on the electrical conductivity of a semiconducting material which is maintained at a suitable operating temperature by an electric resistance heater, the heater has an appreciable temperatu... | 01/13/1976 |
