Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid pressure responsive by-pass
Reexamination Certificate
2005-08-30
2005-08-30
Cecil, Terry K. (Department: 1723)
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Fluid pressure responsive by-pass
C210S136000, C210S430000, C210S440000, C137S512400
Reexamination Certificate
active
06936162
ABSTRACT:
A unitary three valve filter element support is used in a filter cartridge in which the filter cartridge includes an annular filter element within a housing closed by an end plate having a central opening surrounded by an array of radial openings spaced a fixed radial distance from one another. The unitary support has an annular sealing lip for sealing with the end cap of the filter element, which sealing lip deflects under oil pressure providing a first valve to allow oil to bypass the filter element if the filter media of the filter element is clogged. A second valve is a dirty side anti-drainback valve that is provided by a radial flange projecting from the unitary body. A third valve is a clean side valve aligned with the hollow core of the annular filter element to prevent drainback of clean oil and to prevent refilling of the filter cartridge with used or unfiltered oil.
REFERENCES:
patent: 3369666 (1968-02-01), Hullgren et al.
patent: 3567023 (1971-03-01), Buckman et al.
patent: 3785491 (1974-01-01), Dudinec et al.
patent: 3802564 (1974-04-01), Turman
patent: 3957640 (1976-05-01), Stack
patent: 4144168 (1979-03-01), Thornton
patent: 4524805 (1985-06-01), Hoffman
patent: 5250176 (1993-10-01), Daniel
patent: 6136183 (2000-10-01), Suzuki et al.
Cecil Terry K.
Dana Corporation
Millen White Zelano & Branigan P.C.
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