US Patent 7501935 Multi-frequency fire alarm sounder
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Patent Inventor Names
Charles F. Fisler0
Manley S. Keeler0
Simon Ha0
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Article (+517 characters)
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Patent abstract
An audible output device, of a type usable in a fire alarm system, incorporates a multi-frequency waveform generator. The generator produces a plurality of frequencies with predetermined duty factors during various time intervals on a repetitive basis. The multi-frequency drive signal is in turn coupled to an audible output device such as a piezoelectric horn or the like. The multi-frequency audio output provides an indicator to persons adjacent to the device of the presence of an alarm condition.
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US Patent 07501935 Multi-frequency fire alarm sounder US Patent 7501935 Multi-frequency fire alarm sounder
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Patent Number
075019350
Patent Number
75019350
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Patent Jurisdiction
Patent Number
075019350
Date of Patent
March 10, 2009
0Patent Application Number
119243640
Date Filed
October 25, 2007
0Official Website
Patent Primary Examiner
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US Patent 07501935 Multi-frequency fire alarm sounder
Infobox
Is a
Patent jurisdiction
Patent number
07501935
Date of patent
March 10, 2009
Patent application number
11924364
Date Filed
October 25, 2007
Patent primary examiner
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