ApplicationNo. 05/585537 filed on 06/10/1975
US Classes:340/539.22Having plural distinct sensors (i.e., for surrounding conditions)
ExaminersPrimary: Caldwell, Sr., John W.
Assistant: Crosland, Donnie L.
Attorney, Agent or Firm
International ClassesG08B 29/02 (20060101)
G08B 29/00 (20060101)
Foreign Application Priority Data1974-06-18 AU
AbstractA fire detection system for use in buildings is provided with transmitters which are listened to by remote receivers and which indicate the present conditions such as fire, smoke or dust, which are to be guarded against. The transmitters have a monitoring mode in which the monitoring mode signal is detected by the receivers within predetermined recurring successive intervals of time which are long relative to the time periods between successive monitoring mode signals and which are very long indeed compared with the duration of each monitoring mode signal.