Two channel optical flame detector
Patent 4206454 Issued on June 3, 1980. Estimated Expiration Date: 
May 8, 1998. 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.
May 8, 1998. 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 3122638 3222661 3539804 3716717 Dual spectrum infrared fire detector Flame detection system Discriminating fire sensor Flame sensing system Flame sensing system Patent #: 4160164 InventorsAssigneeApplicationNo. 05/903927 filed on 05/08/1978US Classes:340/578, By radiant energy250/339.15, Sensing flame or explosion250/554, Flame light source340/600Radiant energyExaminersPrimary: Caldwell, Sr., John W.Assistant: Nowicki, Joseph E. Attorney, Agent or FirmInternational ClassG08B 17/12 (20060101)AbstractA flame detector which is capable of discriminating between hydrocarbon fires and background radiation produced by the sun, artificial light or black body radiation. Two radiation sensors are provided, each being responsive to separate known radiation peaks produced by a hydrocarbon fire. Logic circuitry is provided which produces an alarm signal only when the radiation received by each sensor is above a predetermined value, and when the radiation received by one specified sensor is greater than the radiation received by the other sensor.Field of SearchBy radiant energy | |
