Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Fluid pressure responsive
Reexamination Certificate
2007-02-27
2007-02-27
Cecil, Terry K. (Department: 1723)
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Fluid pressure responsive
C210S091000, C210S094000, C210S132000, C116S277000, C123S1960AB, C340S607000
Reexamination Certificate
active
10756994
ABSTRACT:
A fuel filter includes a first filter chamber, a second filter chamber and a valve assembly disposed between the first and second filter chambers. The valve assembly includes a valve casing with a valve head connected to a flag indicator slidably disposed within the valve casing and movable between a first and second position. A port located in the valve casing allows fuel to flow from the first filter chamber to the second filter chamber when the valve head and flag indicator moves from the first position to the second position. A transparent portion of the valve casing allows the flag indicator to be visible in the second position allowing a user to determine that the fuel filter must be serviced or removed and replaced.
REFERENCES:
patent: 4322290 (1982-03-01), Carl
patent: 4574836 (1986-03-01), Barnard, Jr.
patent: 5766449 (1998-06-01), Davis
patent: 5858227 (1999-01-01), Stone et al.
patent: 6171492 (2001-01-01), Hedgepath et al.
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