Liquid purification or separation – Flow – fluid pressure or material level – responsive – Check valve
Reexamination Certificate
2005-12-13
2005-12-13
Cecil, Terry K. (Department: 1723)
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Check valve
C210S430000, C210S443000, C210SDIG017, C137S846000
Reexamination Certificate
active
06974539
ABSTRACT:
A combined filter element support and anti-prefill valve is used with an annular filter element having an annular filter media with a hollow core for filtering lubricating oil or fuel. The combined filter element includes a unitary body having an annular portion, wherein the annular portion has annular shoulder extending radially therefrom for supporting the filter element, and a sealing section which engages the end plate over a continuous location which is coaxial with the central spin-on opening. The unitary body has a radially extending plate portion having an axially positioned one-way valve unitary therewith, which valve opens in an axial direction toward the spin-opening. In a preferred embodiment, the one-way valve is configured by a pair of lips which normally abut along a line and separate when subjected to oil or fuel pressure.
REFERENCES:
patent: 3369666 (1968-02-01), Hultgren et al.
patent: 3567023 (1971-03-01), Buckman et al.
patent: 3802564 (1974-04-01), Turman
patent: 4524805 (1985-06-01), Hoffman
Berenato White & Stavish
Cecil Terry K.
WIX Filtration Corp.
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