Controls for maintaining low nitrogen oxides content in internal combustion engine exhaust gases
Patent 3974040 Issued on August 10, 1976. Estimated Expiration Date: 
August 10, 1993. 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.
August 10, 1993. 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 2991412 3223597 3291705 3314863 3622487 3719564 3768259 3821090 3827237 Activated stable oxygen electrode Patent #: 3930884 InventorsAssigneeApplicationNo. 484301 filed on 06/28/1974US Classes:205/781, Including nitrogen oxide (e.g., gaseous nitrogen dioxide, dissolved sodium nitrate, etc.)204/410, Solid electrolyte means204/415, Selectively permeable membrane204/432, With gas diffusion electrode60/276, Having means analyzing composition of exhaust gas60/285Engine fuel, air, or ignition controlled by sensor of reactor conditionExaminersPrimary: Tung, T.Attorney, Agent or FirmInternational ClassB01D 53/30 (20060101)Foreign Application Priority Data1973-07-12 DTAbstractControl system and apparatus for measuring and monitoring the nitrogen oxides content of internal combustion engine exhaust gases. The exhaust gases are contacted with the reducing electrode of a sensor cell having a predetermined potential established between the cell electrodes so that the reducing electrode is able to reduce both the nitrogen oxides and oxygen content of the exhaust gas. The current flowing through the sensor cell is measured to determine whether the nitrogen oxides content of the exhaust gas is sufficiently low. |
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