Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid pressure responsive by-pass
Reexamination Certificate
2007-10-09
2007-10-09
Drodge, Joseph (Department: 1723)
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Fluid pressure responsive by-pass
C055S315000, C055S323000, C210S132000, C210S315000, C210S338000, C210S433100
Reexamination Certificate
active
10467365
ABSTRACT:
A filter device has a filter housing (10) receiving a first filter element (12), through which a medium may flow in a given direction, and has a bypass device (22). Along with the first filter element (12), a second filter element (32) is provided. The filter elements are arranged in series, one behind the other, in the direction of flow. When the bypass device (22) is activated, the second filter element (32), immediately following in the direction of flow, filters the medium. The second filter element thus takes over the main filtration of the medium on actuation and operation of the bypass device, since the first filter element is essentially no longer available for a filtration process due to the bypass device.
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Sann Norbert
Wilkendorf Werner
Drodge Joseph
Hydac Filtertechnik GmbH.
Roylance Abrams Berdo & Goodman L.L.P.
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