Patent · US Expired

Fire alarm

US7365648B2 · kind B2 · utility

1Cited by

4References

21Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Bernd Siber · Glonn, DE
Stefan Sittenauer · Munich, DE
Gottfried Ernst · Andechs, DE
Ulrich Oppelt · Zorneding, DE

Key dates

Filing date	Dec 14, 2004
Grant date	Apr 29, 2008
Priority date	—
Expiry date	Jun 23, 2025

Classification

Technology area (CPC G)Physics
CPC primaryG08B17/113
WIPO fieldControl
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.