Pleated filter and support tube therefor

Details Pleated filter and support tube therefor Pleated filter and support tube therefor

1998-10-29

2001-03-27

Savage, Matthew O. (Department: 1723)

Liquid purification or separation

Filter

With central pervious tubular receiver

C210S493100

Reexamination Certificate

active

06206205

ABSTRACT:

FIELD OF THE INVENTION
The disclosure describes filter constructions for engines and methods. In particular, the disclosure describes an inner support tube and improvements associated with the manufacture of such tubes.
BACKGROUND OF THE INVENTION
Filter constructions used for engines sometimes include a center tube to provide the structural strength necessary to keep the filter media from collapsing due to the pressure differential across the filter as the filter media becomes plugged with contaminant. The inner support tube typically allows for the passage of gas or liquid therethrough, in order for the filter to operate properly. For example, the tube may be perforated or constructed from an expanded metal.
In some constructions, the inner support tube is formed by rolling the metal sheet into a cylinder and either welding the ends together at a seam, or bending the ends together to form a lock seam.
SUMMARY OF THE INVENTION
In one aspect of the present invention, one example embodiment involves a filter support including a tubular construction that has flow apertures, a top edge, an opposite bottom edge, and first and second side edges extending between the top and bottom edges. The first and second side edges oppose each other to form a seam region having a non-axial seam center line extending between the top edge and the bottom edge.
In another aspect of the present invention, a filter construction includes a region of pleated media and a tubular construction supporting the region of pleated media. The tubular construction has structure as previously described.


REFERENCES:
patent: 2801009 (1957-07-01), Bowers
patent: 3042216 (1962-07-01), Goldman
patent: 4369113 (1983-01-01), Stifelman
patent: 4969994 (1990-11-01), Misgen et al.
patent: 5104537 (1992-04-01), Stifelman et al.
patent: 5252207 (1993-10-01), Miller et al.
patent: 5460721 (1995-10-01), Goodwin
patent: 197 45 924 A1 (1998-05-01), None
patent: 0 353 622 A1 (1990-02-01), None
patent: 0 568 381 A1 (1993-11-01), None
patent: 1408804 (1975-10-01), None
patent: 867397 (1975-10-01), None
patent: WO 92/16280 (1992-10-01), None

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