US4995985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gel bead composition for metal adsorption
Assignee: Lockheed Martin Energy Systems Inc
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Filing: 1990-04-25
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Granted: 1991-02-26
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Expires: 2010-04-25
Abstract
Abstract The invention is a gel bead comprising propylene glycol alginate and bone gelatin and is capable of removing metals such as Sr and Cs from solution without adding other adsorbents. The invention could have application to the nuclear industry's waste removal activities.
Inventors
- 👤 Charles D. Scott
- 👤 Charlene A. Woodward
- 👤 Charles H. Byers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:40
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
33 words
A process for removing metals from an aqueous stream comprising: mixing an aqueous stream containing metals with gel beads of propylene glycol alginate and bone gelatin thereby trapping said metals within said beads.
Claim 2
Dependent Claim
33 words
A process for removing metals from an aqueous stream comprising: mixing an aqueous stream containing metals with gel beads of propylene glycol alginate and bone gelatin thereby trapping said metals within said beads.
Claim 3
Dependent Claim
41 words
The process of claim 1 wherein said propylene glycol alginate is present in concentrations of from 1 to 5 wt % and said bone gelatin is present in concentrations of from 3 to 25 wt %, with the balance being water.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein said beads have incorporated within said bead a biological adsorbent capable of removing metals from solution.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein said metal is selected from the group consisting of strontium and cesium.
References Cited (Backward Citations)
US3894871A
Cited
US4612247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |