Communications: electrical – Systems – Manual alarm telegraph; e.g. – other than signal box type
Reexamination Certificate
2005-11-01
2005-11-01
Swarthout, Brent A. (Department: 2636)
Communications: electrical
Systems
Manual alarm telegraph; e.g., other than signal box type
C340S506000, C340S538000, C340S577000
Reexamination Certificate
active
06960987
ABSTRACT:
Disclosed herein is a fire alarm system for connecting a plurality of fire sensors to sensor lines, and giving an alarm in response to fire information output from the fire sensor in a line unit. The fire alarm system includes a current modulation section and an address specification section. The current modulation section is used for maintaining a current flowing in the sensor line at a predetermined value for a predetermined time at the time of a fire, and modulating the current in accordance with the inherent address information of the fire sensor. The address specification section is used for sensing fire information by judging whether or not the current has been maintained at the predetermined value for the predetermined time, and also for specifying the inherent address of the fire sensor that issued the fire information, from the modulated state of the current.
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Partial European Search Report, Aug. 28, 2003.
European Search Report, dated Feb. 3, 2004.
Dohi Manabu
Matsuoka Naoya
Nemoto Masahiko
Shima Hiroshi
Yamano Naoto
Blank Rome LLP
Hochiki Corporation
Swarthout Brent A.
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