Smoke detector

Details Smoke detector Smoke detector

2007-07-24

2007-07-24

Hofsass, Jeffery (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S628000, C340S693600, C381S181000, C348S135000

Reexamination Certificate

active

11108747

ABSTRACT:
A dark chamber is adapted to accommodate smoke particles. A photo emitter and a photo detector are disposed in the dark chamber. In a first region, a region where light emitted from the photo emitter passes and a region where the photo detector is capable of detecting light are overlapped, so that light emitted from the photo emitter and scattered by the smoke particles is detected by the photo detector. A photo converger converges light passed through the first region at a second region where is an outside of the first region.

REFERENCES:
patent: 4857895 (1989-08-01), Kaprelian
patent: 5231378 (1993-07-01), Dennis et al.
patent: 6737977 (2004-05-01), Nishikawa et al.
patent: 2002/0060632 (2002-05-01), Kadwell et al.
patent: 481997 (1992-03-01), None
patent: 11248628 (1999-09-01), None
patent: 200065740 (2000-03-01), None
patent: 200065741 (2000-03-01), None
patent: 2000065740 (2000-03-01), None
patent: 2000065741 (2000-03-01), None
GB Office Action dated May 20, 2005 (copy attached).

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