US4902427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for removing heavy metals from drinking water
Assignee: Ebonex Corp
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Filing: 1988-04-25
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Granted: 1990-02-20
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Expires: 2008-04-25
Abstract
Abstract A filter for reducing heavy metals in water employs particulate boneblack (bone char) material as a filtration agent. A layer of boneblack (bone char) impregnated filter material and a layer of fibrous substrate are helically interwound around a hollow, porous central core to form the cartridge elements of a filter cartridge designed to reduce heavy metal concentrations in drinking water. A porous outer cage encloses the helically wound layers, and end caps are bonded to the cartridge elements at each end thereof. Methods of using boneblack particles to reduce heavy metal concentrations in water are also disclosed.
Inventors
- 👤 Michael F. Szczepanik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:24
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/28; C02F1/288; B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D29/50; B01D29/56; B01D29/58; B01D39/00; B01J; B01J20/00; B01J20/02; B01J20/20; C02F1/283; C02F2101/00; C02F2101/10; C02F2101/20; C02F2201/00; C02F2201/002; C02F2201/006; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
A filter cartridge for removing heavy metals from water comprising: a hollow, porous central core; means for absorbing heavy metal comprising a fibrous substrate and a bone char impregnated filter layer helically interwound around said central core so as to form a generally cylindrical filter element; a porous outer cage disposed about at least a portion of said filter element distal said core; and an end cap bonded to each end of the filter element, at least one of said end caps having an opening therethrough for establishing fluid communication with the central core.
Claim 2
Dependent Claim
94 words
A filter cartridge for removing heavy metals from water comprising: a hollow, porous central core; means for absorbing heavy metal comprising a fibrous substrate and a bone char impregnated filter layer helically interwound around said central core so as to form a generally cylindrical filter element; a porous outer cage disposed about at least a portion of said filter element distal said core; and an end cap bonded to each end of the filter element, at least one of said end caps having an opening therethrough for establishing fluid communication with the central core.
Claim 3
Dependent Claim
28 words
The filter cartridge of claim 1 wherein the bone char is virgin bone char with a particle size of at least as fine as 30 by 90 mesh.
Claim 4
Dependent Claim
25 words
The filter cartridge of claim 1 wherein the bone char is spent material having a particle size of at least as fine as 200 mesh.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |