Filter insert with variable length center tube

Details Filter insert with variable length center tube Filter insert with variable length center tube

2007-03-20

2007-03-20

Cecil, Terry K. (Department: 1723)

Liquid purification or separation

Filter

With central pervious tubular receiver

C210S497010

Reexamination Certificate

active

10759219

ABSTRACT:
A filter insert (1) having an annular filter element (2) which is connected in a fluid-tight manner to a cover (5) on one axial end face (3) and to a base (6) on an opposite axial end face (4). The filter element (2) has a central channel (25) in which a central tube (8, 28) is situated. The central tube (8, 28) extends between the cover (5) and the base (6) and communicates with a central opening (7) in the cover (5). To ensure high stability of the filter (1) with a low manufacturing complexity, the central tube (8, 28) is designed to have a variable length in the direction of its longitudinal central axis (10).

REFERENCES:
patent: 3246766 (1966-04-01), Pall
patent: 3592766 (1971-07-01), Kudlaty
patent: 3642141 (1972-02-01), Hobson, Jr.
patent: 4442004 (1984-04-01), Smith et al.
patent: 5043068 (1991-08-01), Karbachsch et al.
patent: 90 16 239.0 (1991-03-01), None
patent: 94 19 087.9 (1995-03-01), None
patent: 1027335 (1966-04-01), None
German Search Report dated Sep. 18, 2003, including the English translation of the relevant portion (Four (4) pages).

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