Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Stefan Sittenauer0
Ulrich Oppelt0
Bernd Siber0
Gottfried Ernst0
Date of Patent
April 29, 2008
0Patent Application Number
110115480
Date Filed
December 14, 2004
0Patent Primary Examiner
Patent 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.
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