Liquid purification or separation – Filter – With movable means to compress medium
Reexamination Certificate
2001-08-16
2004-07-13
Savage, Matthew O. (Department: 1723)
Liquid purification or separation
Filter
With movable means to compress medium
C210S497100
Reexamination Certificate
active
06761270
ABSTRACT:
BACKGROUND OF THE INVENTION
1) Field of the Invention
The subject invention generally relates to a filter assembly and method of filtering utilizing the filter assembly to filter a fluid. More specifically, the subject invention relates to an adjustable filter assembly including a filter element and filtration apertures that are defined between crests and troughs of adjacent wave coils of the filter element wherein the filtration apertures are adjustable.
2) Description of Related Art
Spring filters are known in the art. Helically- or spirally-wound spring filters are also known in the art. Examples of such conventional spring filters are disclosed in U.S. Pat. Nos. 4,113,000; 4,199,454; and 5,152,892. Conventional spring filters, including the helically- and spirally-wound spring filters disclosed in the above-referenced patents, are deficient for various reasons. For instance, certain conventional spring filters are not adjustable. Other conventional spring filters are not easily adjustable and are not easily manufactured. As one specific example, the conventional spring filter disclosed in the '892 patent is deficient because the entire coil of this conventional spring filter, which is made up of a plurality of individual flat coils, is extremely weak having a k factor of about zero. As a result, filtration gaps, or filtration apertures, can not be maintained between the individual flat coils when the spring filter is vertically-oriented. This conventional spring filter is also particularly difficult to manufacture. More specifically, this conventional spring filter requires that the individual flat coils of the filter be manufactured such that the filtration apertures, between adjacent flat coils progressively increase in size and pitch which, as understood by those skilled in the art, is a particularly cumbersome requirement. This conventional spring filter further requires that projections be machined into each coil to maintain a minimum filtration aperture between adjacent coils of the filter, thus involving additional machining requirements and even limits on size of the spring filter.
Due to the deficiencies identified in the spring filters of the prior art, including those set forth above, it is desirable to implement an adjustable filter assembly that is ideal to manufacture and that uniquely defines a filtration aperture between adjacent coils of a filter element for optimum filtering of fluids due to the adjustability of the filtration aperture. It is also desirable that the adjustable filter assembly according to the subject invention can be easily manufactured into a wide range of sizes and stiffnesses of the filter element.
SUMMARY OF THE INVENTION AND ADVANTAGES
A filter assembly and method of filtering utilizing the filter assembly to filter a fluid are disclosed. The filter assembly includes a plurality of wave coils. The wave coils include at least one crest and at least one trough and are arranged axially to define a filter element. The filter element includes first and second ends and an inner cavity. The filter assembly also includes a support that engages either the first or second end of the filter element for supporting the wave coils. The support also diverts the fluid inside or outside of the inner cavity of the filter element. The crest of one wave coil engages the trough of an adjacent wave coil to define at least one filtration aperture between each crest and each trough of the adjacent wave coils.
The fluid flows toward the support such that the support diverts the fluid to the inside or the outside of the inner cavity of the filter element. The fluid diverted by the support is filtered through the filtration apertures. More specifically, if the fluid flows toward the support and is diverted to the inside of the inner cavity and then through the filtration apertures, then a filtrate of the fluid, which also flows through the filtration apertures, passes through the outside of the inner cavity, and a retentate of the fluid, which cannot flow through the filtration apertures, is retained on the inside of the inner cavity of the filter element. Alternatively, if the fluid flows toward the support and is diverted to the outside of the inner cavity and then through the filtration apertures, then the filtrate of the fluid flows through the filtration apertures and passes through the inside of the inner cavity, whereas the retentate of the fluid is retained on the outside of the inner cavity of the filter element.
Accordingly, the subject invention provides a filter assembly that establishes a filtration aperture between adjacent coils of a filter element included in the filter assembly. Additionally, the filter assembly of the subject invention is easily manufactured.
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PCT International Search Report, International Application No. PCT/US01/25731; International Filing Date Aug. 16, 2001.
English translation to Russian Patent No. 2077925 C1 to Krapukhin.
Howard & Howard
Savage Matthew O.
LandOfFree
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