Dual spectrum infrared fire sensor
Patent 4296324 Issued on October 20, 1981. Estimated Expiration Date: 
November 2, 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.
November 2, 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 2692982 2722677 3609364 3665440 3716717 3825754 Dual spectrum infrared fire detector Discriminating fire sensor Flame sensing system Flame sensing system InventorsAssigneeApplicationNo. 06/090701 filed on 11/02/1979US Classes:250/339.15, Sensing flame or explosion250/340MethodsExaminersPrimary: Smith, Alfred E.Assistant: Howell, Daniel W. Attorney, Agent or FirmInternational ClassesG01J 5/60 (20060101)G08B 17/12 (20060101) AbstractDisclosed is a fire and explosion detection system wherein long wavelength radiant energy responsive signals are processed in one channel and compared to short wavelength radiant energy responsive signals which are processed in a second channel. At least one of the channels is responsive to a wavelength where at least one of the combustion products of the fire or explosion exhibits a strong absorption band in the atmosphere. When the signals from the two channels are coincident in response to a fire or explosion of a predetermined threshold magnitude, an output fire suppression signal is generated.Field of SearchMethods | |
