US4789475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water purification material, process therefor, and device for the removal of heavy metal toxins
Assignee: ENVIRONMENTAL CONCERNS Inc 1421 OLD COUNTY ROAD BELMONT CA 94002 A CA CORP
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Filing: 1987-06-23
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Granted: 1988-12-06
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Expires: 2007-06-23
Abstract
Abstract A filter bed material for the removal of heavy metal ions from water and process for the manufacture thereof. The bed material includes a charcoal bed having a chelating agent adsorbed thereto utilizing a polymer to aid in the adsorption of the chelating compound.
Inventors
- 👤 Richard A. Harte
- 👤 David B. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:47
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/68; C02F1/683; C02F1/28; C02F1/283; C02F1/288; C22; C22B; C22B3/00; C22B3/20; C22B3/22; C22B3/24; C02F2201/00; C02F2201/002; C02F2201/006; C02F2307/00; C02F2307/06; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/911; Y10S210/912; Y10S502/00; Y10S502/515; Y10S502/516
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
A process for the manufacture of a filter bed material including the following steps: bathing a bed material in a solution of 0.01% to 1.5% polymer solution, said polymer solution containing a chelating agent; agitating said solution; removing said bed material from the solution; drying said bed material; treating said bed material with an acidic solution; removing said bed material from the acidic solution; and drying said bed material.
Claim 2
Dependent Claim
69 words
A process for the manufacture of a filter bed material including the following steps: bathing a bed material in a solution of 0.01% to 1.5% polymer solution, said polymer solution containing a chelating agent; agitating said solution; removing said bed material from the solution; drying said bed material; treating said bed material with an acidic solution; removing said bed material from the acidic solution; and drying said bed material.
Claim 3
Dependent Claim
15 words
A process as described in claim 1 wherein said filter bed material includes activated charcoal.
Claim 4
Dependent Claim
29 words
A process as described in claim 1 wherein said chelating agent is one or more of the chemicals selected from the group consisting of EDTA, Penicillamine, BAL and DMS.
Claim 5
Dependent Claim
46 words
A process as described in claim 1 wherein said chelating agent consists of one or more of the water based chelating chemical solutions selected from the group consisting of 0.01% to 0.75% EDTA, 0.01% to 0.75% DMS, 0.01% to 0.75% Penicillamine, and 0.01% to 0.75% BAL.
Claim 6
Dependent Claim
27 words
A process as described in claim 4 wherein said chelating chemical solution is further defined as consisting of 0.05% calcium disodium EDTA, 0.05% DMS and 0.05% BAL.
Claim 7
Dependent Claim
16 words
A process as described in claim 5 wherein said acidic solution comprises 0.1% glacial acetic acid.
Claim 8
Dependent Claim
29 words
A process as described in claim 1 wherein said polymer includes one or more of the polymers selected from the group consisting of methyl methacrylate, butyl methacrylate, and styrene.
Claim 9
Dependent Claim
29 words
A process as described in claim 7 wherein said chelating chemical is one or more of the chemicals selected from the group consisting of EDTA, Penacillamine, BAL, and DMS.
Claim 10
Dependent Claim
46 words
A process as described in claim 7 wherein said chelating agent consists of one or more of the water based chelating chemical solutions selected from the group consisting of 0.01% to 0.75% EDTA, 0.01% to 0.75% DMS, 0.01% to 0.75% Penicillamine, and 0.01% to 0.75% BAL.
Claim 11
Dependent Claim
27 words
A process as described in claim 9 wherein said chelating chemical solution is further defined as consisting of 0.05% calcium disodium EDTA, 0.05% DMS and 0.05% BAL.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |