Fire alarm

Details Fire alarm Fire alarm

2008-04-29

2008-04-29

Nguyen, Tai (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S693110, C340S577000, C340S578000, C340S628000, C340S632000, C340S633000

Reexamination Certificate

active

11011548

ABSTRACT:
A fire alarm for an installation via a housing that is flush with the ceiling, having at least one light source arranged in the housing and at least one light receiver arranged in the housing, as well as a shutter disk, which seals the housing. To prevent the spreading of stray light between the light source and the light receiver via the shutter disk, a shield, for example, is provided in the shutter disk to suppress or absorb stray light.

REFERENCES:
patent: 4616928 (1986-10-01), Leavitt et al.
patent: 4906978 (1990-03-01), Best et al.
patent: 5138302 (1992-08-01), Nagaoka et al.
patent: 6300876 (2001-10-01), Sakurai et al.
patent: 2003/0215766 (2003-11-01), Fischer et al.
patent: 2005/0143717 (2005-06-01), Peyman
patent: 199 12 911 (2000-10-01), None
patent: 100 46 992 (2002-06-01), None
patent: 55-036785 (1980-03-01), None

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