(JP6507013-W)      Process comprises mixing antimony bearing material with tin oxide powder; forming the sensor by deposition of the slurry onto a substrate, and drying and sintering the slurry. The antimony bearing material is sufficient to render the sensor's sensitivity to the gases H2, CO, or CH4, independent of the O2 concentration in the range PO2 10power-4 atmosphere.    A method of making a tin oxide gas sensor of resistivity that at a measuring temperature increases with concentration of the measured gas, comprises: calcining the tin oxide in air above 1400 degrees Celsius, or a similar treatment.    USE/ADVANTAGE -   The measured resistance, or other electrical property, of a sample of tin (IV) oxide (snO2) can be used as a gas sensor as this property is dependent on the concentration of gas in the surrounding medium. The resistivity of a tin oxide gas sensor at a measuring temperature increases with increase in concentration of at least one gas to be measured by inducing non-stoichiometry in the tin oxide.    (US5427740-A)      Tin oxide sensors doped with Sb(3) as a dopant in oxide form are produced by mixing a slurry contg. the component oxides before drying and sintering. The level of antimony present is such that the device is sensitive to H2, CO or CH4 but not sensitive to oxygen in the range PO2 10 power(-4) atm.    USE/ADVANTAGE -   Used in gas detectors or alarm systems. By controlling the level of doping the effects of oxygen can be reduced.    (EP579639-B1)      Process comprises mixing antimony bearing material with tin oxide powder; forming the sensor by deposition of the slurry onto a substrate, and drying and sintering the slurry. The antimony bearing material is sufficient to render the sensor's sensitivity to the gases H2, CO, or CH4, independent of the O2 concentration in the range PO2 10power-4 atmosphere.    A method of making a tin oxide gas sensor of resistivity that at a measuring temperature increases with concentration of the measured gas, comprises: calcining the tin oxide in air above 1400 degrees Celcius, or a similar treatment.    USE/ADVANTAGE -   The measured resistance, or other electrical property, of a sample of tin (IV) oxide (snO2) can be used as a gas sensor as this property is dependent on the concentration of gas in the surrounding medium. The resistivity of a tin oxide gas sensor at a measuring temperature increases with increase in concentration of at least one gas to be measured by inducing non-stoichiometry in the tin oxi    (JP11094786-A)      Process comprises mixing antimony bearing material with tin oxide powder; forming the sensor by deposition of the slurry onto a substrate, and drying and sintering the slurry. The antimony bearing material is sufficient to render the sensor's sensitivity to the gases H2, CO, or CH4, independent of the O2 concentration in the range PO2 10power-4 atmosphere.    A method of making a tin oxide gas sensor of resistivity that at a measuring temperature increases with concentration of the measured gas, comprises: calcining the tin oxide in air above 1400 degrees Celcius, or a similar treatment.    USE/ADVANTAGE -   The measured resistance, or other electrical property, of a sample of tin (IV) oxide (snO2) can be used as a gas sensor as this property is dependent on the concentration of gas in the surrounding medium. The resistivity of a tin oxide gas sensor at a measuring temperature increases with increase in concentration of at least one gas to be measured by inducing non-stoichiometry in the tin oxi    (JP3046353-B2)      Process comprises mixing antimony bearing material with tin oxide powder; forming the sensor by deposition of the slurry onto a substrate, and drying and sintering the slurry. The antimony bearing material is sufficient to render the sensor's sensitivity to the gases H2, CO, or CH4, independent of the O2 concentration in the range PO2 10power-4 atmosphere.    A method of making a tin oxide gas sensor of resistivity that at a measuring temperature increases with concentration of the measured gas, comprises: calcining the tin oxide in air above 1400 degrees Celcius, or a similar treatment.    USE/ADVANTAGE -   The measured resistance, or other electrical property, of a sample of tin (IV) oxide (snO2) can be used as a gas sensor as this property is dependent on the concentration of gas in the surrounding medium. The resistivity of a tin oxide gas sensor at a measuring temperature increases with increase in concentration of at least one gas to be measured by inducing non-stoichiometry in the tin oxi