The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 01, 2005
Filed:
Sep. 19, 2002
Manabu Dohi, Kanagawa-ken, JP;
Masahiko Nemoto, Kanagawa-ken, JP;
Naoto Yamano, Kanagawa-ken, JP;
Hiroshi Shima, Kanagawa-ken, JP;
Naoya Matsuoka, Tokyo, JP;
Manabu Dohi, Kanagawa-ken, JP;
Masahiko Nemoto, Kanagawa-ken, JP;
Naoto Yamano, Kanagawa-ken, JP;
Hiroshi Shima, Kanagawa-ken, JP;
Naoya Matsuoka, Tokyo, JP;
Hochiki Corporation, , JP;
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.