US4235737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating radioactive liquids
Assignee: Individual
•
Filing: 1977-12-29
•
Granted: 1980-11-25
•
Expires: 1997-12-29
Abstract
Abstract A process for treating and handling radioactive liquids and rendering such liquids safe for handling, transportation and disposal, the process comprising adding thereto a small amount of a water-insoluble alkali salt of an aqueous alkali saponified gelatinized-starch-polyacrylonitrile graft polymer, to form a solid, semi-solid or gel product.
Inventors
- 👤 James F. Pritchard
- 👤 Robert R. Komrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:19
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/04; G21F9/06; G21F9/16; G21F9/167
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
A reversible process for treating radioactive liquid composed of radioactive solids dissolved or suspended in a liquid vehicle selected from the group consisting of water and an organic liquid, which process comprises: adding to the radioactive liquid having a pH greater than 5.5, a sufficient amount of an absorbent consisting of a water-insoluble alkali salt of aqueous alkali saponified gelatinized-starch-polyacrylonitrile graft polymer to form a product comprising a gel containing said radioactive solids by the absorption of the said liquid vehicle by said polymer, acidifying said product sufficiently to reliquify said product and separating and recovering said polymer from the reliquified gel.
Claim 2
Dependent Claim
102 words
A reversible process for treating radioactive liquid composed of radioactive solids dissolved or suspended in a liquid vehicle selected from the group consisting of water and an organic liquid, which process comprises: adding to the radioactive liquid having a pH greater than 5.5, a sufficient amount of an absorbent consisting of a water-insoluble alkali salt of aqueous alkali saponified gelatinized-starch-polyacrylonitrile graft polymer to form a product comprising a gel containing said radioactive solids by the absorption of the said liquid vehicle by said polymer, acidifying said product sufficiently to reliquify said product and separating and recovering said polymer from the reliquified gel.
Claim 3
Dependent Claim
32 words
The process of claim 1, wherein the amount of said polymer added to said radioactive liquid is 1 part by weight per 300 to 400 parts by weight of said radioactive liquid.
Claim 4
Dependent Claim
32 words
The process of claim 1, wherein the amount of said polymer added to said radioactive liquid is 1 part by weight per up to 2000 parts by weight of said radioactive liquid.
Claim 5
Dependent Claim
25 words
The process of claim 1, wherein said radioactive liquid is heated to an elevated temperature no greater than the boiling point of said radioactive liquid.
Claim 6
Dependent Claim
12 words
The process of claim 1, including subjecting said radioactive liquid to agitation.
References Cited (Backward Citations)
US2918700A
Cited
US3142648A
Cited
US3262274A
Cited
US3298960A
Cited
US3463738A
Cited
FR2015010A1
Cited
US3773682A
Cited
US3838061A
Cited
US3723338A
Cited
US3896045A
Cited
US3935099A
Cited
US4056112A
Cited
US3969239A
Cited
US4045387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |