Liquid visual display

Details Liquid visual display Liquid visual display

2006-09-08

2008-10-28

Cecil, Terry K (Department: 1797)

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Fluid pressure responsive

C210S094000, C116S268000

Reexamination Certificate

active

07442292

ABSTRACT:
A display provides an indication of the remaining useful life of a filter element by providing a visible level of fluid in the display corresponding to the remaining useful life. The fluid level is adjusted by a valve responsive to a pressure differential across the filter element. An increasing pressure differential produces an increased fluid level in the display. The display may be provided with markings indicating that a particular fluid level in the display corresponds to the need to change a filter cartridge containing the filter element.

REFERENCES:
patent: 2661847 (1953-12-01), Buettner
patent: 6641742 (2003-11-01), Prater et al.
patent: 7182855 (2007-02-01), O'Leary

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