Gas sensor and detection system comprising such a sensor
Patent 4644333 Issued on February 17, 1987. Estimated Expiration Date: 
October 4, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 4, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3801972 3815114 3851520 Battery powered gas level indicator Specificity of semiconductor gas sensor Self-compensating gas detection apparatus Gas detector Patent #: 4490715 InventorsAssigneeApplicationNo. 06/657798 filed on 10/04/1984US Classes:340/634, Semiconductor detector73/31.06SemiconductorExaminersPrimary: Rowland, James L.Assistant: Myer, Daniel Attorney, Agent or FirmInternational ClassesG08B 17/117 (20060101)G08B 17/10 (20060101) Foreign Application Priority Data1983-10-14 NLAbstractGas sensor consisting of a housing which is divided into two compartments 3 and 4 by means of a fluid filter 2, e.g. a bed of activated charcoal. Compartment 3 has an inlet channel 5 and contains a first gas-sensitive semiconductor 6, the measuring device. Compartment 4 has an outlet channel 7 and contains a second gas sensitive semiconductor 8, being used as a reference device. The value of the electric resistances of devices 6 and 8 will increase or decrease when the compartments 3 and 4 contain either an oxidizing or a reducing gas. The sensor is used in a gas detection system in which an electronic circuit which follows determines the ratio between said resistances and the ratio of the reference device and a reference resistance. These ratios are subsequently compared to certain limiting values, and when these values are exceeded, a detection signal will be produced.Other References
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