Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-05-17
2005-05-17
Pham, Toan N. (Department: 2632)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S606000, C340S608000
Reexamination Certificate
active
06894620
ABSTRACT:
A method of monitoring the service life of a filter (1) in a filter system equipped with a fan, in particular a filter (1) in an air conditioning system of a motor vehicle, the instantaneous air speed (21) preferably being measured on each startup of the system using a sensor (2, 20) downstream from the filter (1), compared to the reference air speed (R) from the unloaded filter (1), and transmitted to a service computer and/or indicated on a display, and the need to replace the filter being signaled when this value falls below a predetermined threshold or threshold range of the instantaneous air flow rate (21).
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Borris Richard
Malig Christoph
Reinhardt Heinz
Carl Freudenberg KG
Kenyon & Kenyon
Pham Toan N.
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