Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2006-11-02
2010-10-19
Nguyen, Phung (Department: 2612)
Communications: electrical
Condition responsive indicating system
Specific condition
Reexamination Certificate
active
07817049
ABSTRACT:
A fire detector has at least two sensor units for monitoring a confined space for the occurrence of a fire. A first fire parameter is monitored according to the scattered light method, using a first sensor unit located at or in the vicinity of the ceiling. At least one second sensor unit of the fire detector, which emits at least two highly focused light beams towards the floor of the confined space, monitors a second fire parameter according to the extinction method.
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English translation of Chinese Office Action dated Jul. 10, 2009.
Müller Kurt
Steiner Peter
Greenberg Laurence A
Locher Ralph E
Nguyen Phung
Siemens AG
Stemer Werner H
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