Filter device

Liquid purification or separation – Flow – fluid pressure or material level – responsive – Fluid pressure responsive by-pass

Reexamination Certificate

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Details

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.

REFERENCES:
patent: 3000505 (1961-09-01), Scavuzzo
patent: 3113925 (1963-12-01), Rosaen
patent: 3216571 (1965-11-01), Whiting et al.
patent: 3270884 (1966-09-01), Bremer
patent: 3467256 (1969-09-01), Humbert, Jr. et al.
patent: 4264344 (1981-04-01), Ludecke et al.
patent: 4692175 (1987-09-01), Frantz
patent: 5888383 (1999-03-01), Cox
patent: 5922199 (1999-07-01), Hodgkins
patent: 6117312 (2000-09-01), Mees et al.
patent: 19546440 (1997-06-01), None
patent: 1415943 (1965-10-01), None
patent: 1441269 (1976-06-01), None
patent: 9921637 (1999-05-01), None

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