Automatic self-testing combustion products detector and smoke alarm

Abstract From the Canadian patent

Disclosed is an improved combustion products smoke alarm that includes an electronic circuit which automatically tests the detector's operation repetitively at periodic intervals or, periodically sounds the detector's alarm to remind the occupant to manually test the detector' s operation. In the preferred embodiment, this periodic testing or reminding occurs at weekly intervals. Thus, occupants living about such a smoke alarm after, experiencing this repetitive sounding of the detector' s alarm for some time, will come to anticipate its sounding and notice its absence if the smoke alarm becomes inoperative.