Patent US5019254A successfully refreshed from Google Patents.
US5019254A
Expired / Lapsed
US
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Filter pad with pocket and method of using the same
Assignee: Mars Fishcare North America Inc
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Filing: 1989-08-16
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Granted: 1991-05-28
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Expires: 2009-08-16
Abstract
Abstract Filter pads useful for filtering and removing contaminants from fluids comprise at least two pad layers of a permeable, nonwoven polymer material, where one pad layer is connected to another pad layer to form a pocket therebetween having an opening extending into the pocket and at least one of the pad layers has sufficient structural integrity or rigidity to maintain the shape of the filter pad in a filter apparatus during use. In addition, methods for removing contaminants from fluids comprise passing fluid through filter pads having a pocket having an opening extending therein.
Inventors
- 👤 Albert Abrevaya
- 👤 Joel M. Goldstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:03
CPC Classifications
E; E02; E02B; E02B15/00; E02B15/04; E02B15/10; A; A01; A01K; A01K63/00; A01K63/04; A01K63/045; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0202; B01D17/08; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; C; C02; C02F; C02F1/00; C02F1/001; C02F1/002; C02F1/28; C02F1/281
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
85 words
An aquarium filter pad for filtering aquarium water comprising at least two pad layers of a permeable, nonwoven polymer material, wherein one pad layer is connected to another pad layer to form a pocket therebetween having an opening extending into the pocket, at least one of the pad layers being sufficiently rigid to maintain the shape of the filter pad in an aquarium filter apparatus during use, said at least one rigid pad layer having a density of at least about 9 oz/yd 2 .
Claim 2
Dependent Claim
85 words
An aquarium filter pad for filtering aquarium water comprising at least two pad layers of a permeable, nonwoven polymer material, wherein one pad layer is connected to another pad layer to form a pocket therebetween having an opening extending into the pocket, at least one of the pad layers being sufficiently rigid to maintain the shape of the filter pad in an aquarium filter apparatus during use, said at least one rigid pad layer having a density of at least about 9 oz/yd 2 .
Claim 3
Dependent Claim
66 words
The filter pad according to claim 1, wherein one of the pad layer comprises a permeable, nonwoven polymer material having an adsorbent selected from the group consisting of zeolite and activated carbon bonded substantially throughout the pad layer and being sufficiently rigid to maintain the shape of the filter pad in a filter apparatus during use and another pad layer comprises a permeable, nonwoven polymer material.
Claim 4
Dependent Claim
15 words
The filter pad according to claim 1, wherein the filter pad comprises two pad layers.
Claim 5
Dependent Claim
30 words
The filter pad according to claim 1, wherein the pad layers having a substantially rectangular shape are connected to each other along three sides thereof to form a pocket therebetween.
Claim 6
Dependent Claim
19 words
The filter pad according to claim 4, wherein the pad layers are heat sealed together on three sides thereof.
Claim 7
Dependent Claim
18 words
The filter pad according to claim 4, wherein the pad layers are sewn together on three sides thereof.
Claim 8
Dependent Claim
81 words
The filter pad according to claim 1, wherein first and second pad layers are connected to each other substantially completely along peripheral edges thereof and a third pad layer is connected to the second pad layer to form a pocket between the second and third pad layers having an opening extending into the pocket, at least one of the first and second pad layers being sufficiently rigid to maintain the shape of the filter paid in a filter apparatus during use.
Claim 9
Dependent Claim
58 words
The filter pad according to claim 7, wherein the first pad layer comprises a permeable, nonwoven polymer material having zeolite bonded substantially throughout the first pad layer, the second pad layer comprises a permeable, nonwoven polymer material having activated carbon bonded substantially throughout the second pad layer and the third pad layer comprises a permeable, nonwoven polymer material.
Claim 10
Dependent Claim
34 words
The filter pad according to claim 8, wherein the third pad layer has a color sufficient to indicate the presence of filtered materials which discolor or occlude the color of the third pad layer.
Claim 11
Dependent Claim
38 words
The filter pad according to claim 1, wherein the nonwoven polymer material comprises a lofty, nonwoven pad of polymeric fibers generally randomly oriented throughout the polymer material and bonded together at points where the fibers contact each other.
Claim 12
Dependent Claim
13 words
The filter pad according to claim 10, wherein the fibers comprise polyethylene terephthalate.
Claim 13
Dependent Claim
26 words
The filter pad according to claim 10, wherein the polymer pad material has a density of about 2 oz/yd 2 to about 13 oz/yd 2 .
Claim 14
Dependent Claim
28 words
The filter pad according to claim 12, wherein the rigid pad layer has a density of at least about 9 oz/yd 2 to about 13 oz/yd 2 .
Claim 15
Dependent Claim
30 words
The filter pad according to claim 1, further comprising a filter material selected from the group consisting of zeolite, activated carbon and a biological filter medium disposed in the pocket.
Claim 16
Dependent Claim
26 words
The filter pad according to claim 14, wherein the filter material is present in a form selected from the group consisting of chips, powders and beads.
Claim 17
Dependent Claim
21 words
A method for removing contaminants from a contaminant-containing fluid comprising passing the fluid through the filter pad according to claim 1.
Claim 18
Dependent Claim
12 words
The method according to claim 16, wherein the fluid is a liquid.
Claim 19
Dependent Claim
11 words
The method according to claim 17, wherein the liquid is water.
Claim 20
Dependent Claim
47 words
The method according to claim 16, wherein the fluid is passed through the filter pad in a direction so that the fluid first passes through a pad layer having a color sufficient to indicate the presence of filtered materials which discolor or occlude the colored pad layer.
Claim 21
Dependent Claim
44 words
The method according to claim 19, wherein the fluid is further passed through the pocket after passing through the colored pad layer, the pocket having a filter material selected from the group consisting of zeolite, activated carbon and a biological filter medium disposed therein.
Claim 22
Dependent Claim
38 words
The method according to claim 16, wherein one layer of the filter pad comprises a permeable, nonwoven polymer material having an adsorbent selected from the group consisting of zeolite and activated carbon bonded substantially throughout the pad layer.
Claim 23
Dependent Claim
21 words
The method according to claim 21, wherein the contaminant is capable of being adsorbed by zeolite and the adsorbent comprises zeolite.
Claim 24
Dependent Claim
11 words
The method according to claim 22, wherein the contaminant is ammonia.
Claim 25
Dependent Claim
23 words
The method according to claim 21, wherein the contaminant is capable of being adsorbed by activated carbon and the adsorbent is activated carbon.
Claim 26
Dependent Claim
12 words
The method according to claim 24, wherein the contaminant is hydrogen sulfide.
References Cited (Backward Citations)
US1830664A
Cited
FR825029A
Cited
US2750027A
Cited
US3224586A
Cited
US3327859A
Cited
US3388536A
Cited
CH576872A5
Cited
US3951812A
Cited
US4005010A
Cited
GB1472060A
Cited
DE2362860A1
Cited
US4272264A
Cited
DE2504688A1
Cited
US4016080A
Cited
US4160059A
Cited
US4155971A
Cited
US4111813A
Cited
US4124116A
Cited
US4395332A
Cited
US4256728A
Cited
US4305782A
Cited
US4437429A
Cited
US4488969A
Cited
US4525410A
Cited
US4565727B1
Cited
US4565727A
Cited
US4497712A
Cited
US4781897A
Cited
US4714547A
Cited
US4851273A
Cited
US4838947A
Cited
US4793837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |