Filter cartridge having cone of visibility for end-of-service-life-indicator (ESLI)
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United States of America Patent
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Feb 5, 2013
Grant Date -
Nov 25, 2010
app pub date -
May 22, 2009
filing date -
May 22, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A filter cartridge 12 that includes a filter material 42, an end-of-service-life-indicator 40, a cartridge housing 22, and a window 38. The filter material 42 and ESLI 40 are disposed in the housing, and the ESLI 40 may be viewed through the window 38. The window 38 is configured such that the ESLI 40 can only be seen within a cone defined by an angle θ of 20 to 70 degrees. The limited viewing range precludes reader error when examining the ESLI for color change.
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