Dual spectrum infrared fire detector
Patent 3931521 Issued on January 6, 1976. Estimated Expiration Date: 
January 6, 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.
January 6, 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 ReferencesInventorAssigneeApplicationNo. 05/375265 filed on 06/29/1973US Classes:250/339.04, Including temperature determining means250/339.15, Sensing flame or explosion250/340, Methods250/349Plural signalling meansExaminersPrimary: Willis, Davis L.Attorney, Agent or FirmInternational ClassesG08B 17/12 (20060101)G01J 001/00 () 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. When these signals are coincident in response to a fire or explosion of a predetermined threshold magnitude, an output fire suppression signal is generated. | |
