EP0150559A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Compact water purifying device
Assignee: CONCOR INTERNATIONAL Ltd
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Filing: 1984-09-25
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Granted: —
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Expires: 2004-09-25
Abstract
Abstract A compact water filter is described in which three filters are contained within a single container. The first filter in the sequence is a pre-filter designed to remove large particles from the flow stream, the second an activated carbon filter and the third a ceramic filter preferably containing silver or other bacteriostatic agent. The three filters are assembled within a cylindrical container which is sealed to the filter assembly at each end of its ends, so that a substantially uniform inward flow pattern is established, and so that the relative volumes of the carbon and ceramic materials are appropriate for their functions.
Inventors
- 👤 William E. Giles
- 👤 Kievan Towfigh
- 👤 Royal W. Barnard
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 20:00
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/001; C02F1/003; B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/31; B01D29/33; B01D29/50; B01D29/56; B01D29/58; C02F2201/00; C02F2201/002; C02F2201/006
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
185 words
A water purification filter comprising: a single sealed container, and a first relatively coarse filter stage and a second relatively fine filter stage contained within said single sealed container, said container being provided with an inlet port and an outlet port, said coarser filter being adapted to fit within said container relatively loosely and said finer filter being located centrally within said coarser filter, so that water to be purified may be supplied under pressure to substantially all of the exterior surface of said coarser filter, such that flow through said coarser filter is relatively uniformly radially inward, said finer filter being in communication with the outlet port of said container through an aperture formed in one face of said coarser filter, said coarser filter being sealed to said container around said aperture and outlet port, so that a water flow pattern through said container beginning from said inlet port, thence through said coarser filter, thence through said finer filter, and thence through said outlet port is established, whereby no water can pass through said finer filter without having first passed through said coarser filter.
Claim 2
Dependent Claim
185 words
A water purification filter comprising: a single sealed container, and a first relatively coarse filter stage and a second relatively fine filter stage contained within said single sealed container, said container being provided with an inlet port and an outlet port, said coarser filter being adapted to fit within said container relatively loosely and said finer filter being located centrally within said coarser filter, so that water to be purified may be supplied under pressure to substantially all of the exterior surface of said coarser filter, such that flow through said coarser filter is relatively uniformly radially inward, said finer filter being in communication with the outlet port of said container through an aperture formed in one face of said coarser filter, said coarser filter being sealed to said container around said aperture and outlet port, so that a water flow pattern through said container beginning from said inlet port, thence through said coarser filter, thence through said finer filter, and thence through said outlet port is established, whereby no water can pass through said finer filter without having first passed through said coarser filter.
Claim 3
Dependent Claim
31 words
The filter of claim 1 further comprising a prefilter in said single sealed container enclosing said exterior surface of said coarser filter, whereby clogging of said coarser filter is substantially precluded.
Claim 4
Dependent Claim
16 words
The filter of claim 2 wherein said prefilter has an effective pore size of five microns.
Claim 5
Dependent Claim
35 words
The filter of claim 1 wherein said container is a generally cylindrical canister, said coarser filter is generally tubular and said finer filter is generally cylindrical, fitting within the interior of said tubular coarser filter.
Claim 6
Dependent Claim
34 words
The filter of claim 4 wherein additional water-permeable screen support means are located on the inner cylindrical surface of said tubular coarser filter so as to prevent it from being eroded by water flow.
Claim 7
Dependent Claim
40 words
The filter of claim 4 wherein said generally tubular coarser filter is sealed to said container at both of its longitudinal ends whereby flow of water from said inlet por- through said coarser filter takes place substantially entirely radially inwardly.
Claim 8
Dependent Claim
45 words
The filter of claim 6 wherein said container comprises a generally cylindrical canister having one fixed end and one removable end, said removable end being affixed to said canister by means compressing seal means into engagement.with said coarser filter, whereby said end seals are effected.
Claim 9
Dependent Claim
13 words
The filter of claim 1 wherein said coarser filter material is activated carbon.
Claim 10
Dependent Claim
14 words
The filter of claim 1 wherein said finer filter material is a ceramic material.
Claim 11
Dependent Claim
15 words
The filter of claim 9 wherein said finer filter material additionally comprises a bacteriostatic agent.
Claim 12
Dependent Claim
11 words
The filter of claim 10 wherein said bacteriostatic agent comprises silver.
Claim 13
Dependent Claim
45 words
The filter of claim 9 wherein said ceramic filter is provided with a central flow channel for ensuring that flow through said ceramic filter takes place uniformly from its exterior to said central flow channel, said flow channel being in communication with said outlet port.
Claim 14
Dependent Claim
99 words
A filter for water purification, comprising a single sealable container and plural filtration media adapted for removing differing classes of impurities from water, all of said media being enclosed in said single sealable container, said container comprising means engaging said media such that a water flow path is established between inlet and outlet ports in said container, and so that said water flows through said media in a predetermined fixed sequence, wherein said container is generally cylindrical, said media are coaxial, and said flow path extends generally from the outermost of said media to the center of said container.
Claim 15
Dependent Claim
99 words
A filter for water purification, comprising a single sealable container and plural filtration media adapted for removing differing classes of impurities from water, all of said media being enclosed in said single sealable container, said container comprising means engaging said media such that a water flow path is established between inlet and outlet ports in said container, and so that said water flows through said media in a predetermined fixed sequence, wherein said container is generally cylindrical, said media are coaxial, and said flow path extends generally from the outermost of said media to the center of said container.
Claim 16
Dependent Claim
28 words
The filter of claim 13 wherein said container comprises means for sealing the ends of said container to said coaxial media, so that said flow path is established.
Claim 17
Dependent Claim
39 words
The filter of claim 13 wherein a first one of said media in said sequence is a tubular filter of activated carbon, and a subsequent filter is a cylindrical filter of a ceramic material fitting within said tubular filter.
Claim 18
Dependent Claim
45 words
The filter of claim 15 wherein said container comprises a body portion and a sealing end portion, said sealing end portion being adapted to compress seal means into sealing engagement with said cylindrical carbon filter upon assembly of said end portion to said body portion.
Claim 19
Dependent Claim
24 words
The filter of claim 15 further comprising additional screen means juxtaposed to the inner cylindrical surface of said carbon media to prevent erosion thereof.
Claim 20
Dependent Claim
24 words
The filter of claim 15 further comprising a prefilter interposed in said water flow path prior to said carbon filter for preventing clogging thereof.
Claim 21
Dependent Claim
18 words
The filter of claim 18 wherein said prefilter has an effective pore size substantially equal to five microns.
Claim 22
Dependent Claim
13 words
The filter of claim 15 wherein said ceramic material comprises a bacteriostatic agent.
Claim 23
Dependent Claim
11 words
The filter of claim 20 wherein said bacteriostatic agent comprises silver.
Claim 24
Dependent Claim
58 words
A filter for removing impurities from water comprising: a single sealable container having an inlet port and an outlet port; a first prefilter; a second activated carbon filter; a third ceramic filter; and means for establishing a uniform water flow pattern from said inlet port through said first, second and third filters and thence to said outlet port.
Claim 25
Dependent Claim
58 words
A filter for removing impurities from water comprising: a single sealable container having an inlet port and an outlet port; a first prefilter; a second activated carbon filter; a third ceramic filter; and means for establishing a uniform water flow pattern from said inlet port through said first, second and third filters and thence to said outlet port.
Claim 26
Dependent Claim
25 words
The filter of claim 22 wherein said first, second and third filters are generally coaxial, and said water flow pattern is directed generally radially inward.
Claim 27
Dependent Claim
14 words
The filter of claim 22 wherein said ceramic material additionally comprises a bacteriostatic agent.
Claim 28
Dependent Claim
11 words
The filter of claim 24 wherein said bacteriostatic agent is silver.
Claim 29
Dependent Claim
50 words
The filter of claim 22 wherein flow control means are imposed between said first and second and said second and third filters, said flow control means ensuring that flow through said second filter does not take place radially inwardly, but instead takes place circumferentially around the interior of said filter.
Claim 30
Dependent Claim
83 words
The filter of claim 22 wherein said sealable container comprises a cap portion and a body portion, said portions having mating seal surfaces, one of said cap and said body portion having a sealing ring location groove formed in its mating seal surface, and a resilient sealing ring disposed within said groove, said mating seal surfaces being generally frusto-conical about a given axis, so that said seal is effected by motion along said axis, resulting in compression of said ring between said surfaces.
Claim 31
Dependent Claim
32 words
The filter of claim 27 wherein said cap portion is threadedly connected to said body portion, and said motion is effected by rotation of said cap portion relative to said body portion.
Claim 32
Dependent Claim
15 words
The filter of claim 27 wherein said sealable container is molded of a thermoplastic material.
Claim 33
Dependent Claim
19 words
The filter of claim 22 wherein said container is generally cylindrical and has plural ribs extending radially outward therearound.
References Cited (Backward Citations)
No citation records indexed.
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