Patent US5037950A successfully refreshed from Google Patents.
US3764553A
Expired / Lapsed
US
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Removal of radioisotopes from waste solutions
Assignee: United States Atomic Energy Commission
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Filing: 1972-08-18
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Granted: 1973-10-09
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Expires: 1992-08-18
Abstract
Abstract The invention comprises removing radioisotopes from waste liquids or solutions by passing these through filters and through a column containing a suitable salt of phosphoric acid.
Inventors
- 👤 H Kirby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:18
CPC Classifications
B; B01; B01D; B01D37/00; G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
The method of claim 1 together with, prior to said contacting, and after said filtering, additionally filtering said solution through a from about 0.2 to about 5 microns opening filter means to further separate said insoluble filter aid from said solution thereby removing from about 0.5 percent to about 4.5 percent of the radioisotopic material in said solution.
Claim 2
Dependent Claim
24 words
The method of claim 1 together with disposing Said phosphoric acid salt within a removable container to facilitate removal and replacement of said salt.
References Cited (Backward Citations)
US2981593A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |