Method and apparatus for measuring the O2 content of a gas
Patent 4233033 Issued on November 11, 1980. Estimated Expiration Date: 
September 19, 1999. 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.
September 19, 1999. 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 3558280 3915135 Method and apparatus for measuring the O2 content of a gas Temperature compensated resistive exhaust gas sensor construction Patent #: 4151503 InventorsAssigneeApplicationNo. 06/076881 filed on 09/19/1979US Classes:436/137, Fuel/air mixture or exhaust gas analysis324/717, To determine material composition324/721, For temperature variation338/34, Gas, vapor, or moisture absorbing or collecting422/90, With conductiometric detector422/98, Analysis based on electrical measurement73/23.21With compensation detail (for error or drift correction, etc.)ExaminersPrimary: Serwin, R. E.Attorney, Agent or FirmInternational ClassesF02D 41/14 (20060101)G01N 27/12 (20060101) AbstractA method and apparatus for obtaining an electrical signal which is a function of the 02 content of the exhaust gas of an internal combustion engine. Two resistors (1 and 3) are exposed to the exhaust gas of an internal combustion engine. Both resistors (1 and 3) have a resistance which varies as a function of the temperature of the exhaust gas to which it is exposed. However, the resistance of one of the resistors (1) also varies as a function of the oxygen content in the exhaust gas. Therefore, by applying a voltage to the resistors an electrical signal can be obtained which is a function of the O2 content of the exhaust gas, with the temperature effect of the exhaust gas on the network output being minimized or eliminated. The resistors (1 and 3) that form the sensing elements (10) are connected in series to other resistors to form a first and second resistor network which is connected together in parallel circuit relationship.Other References
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