Patent US4439404A successfully refreshed from Google Patents.
US4439404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of uranium isotopes
Assignee: General Atomics Corp
•
Filing: 1979-11-21
•
Granted: 1984-03-27
•
Expires: 1999-11-21
Abstract
Abstract Methods and apparatus for separation of uranium isotopes by selective isotopic excitation of photochemically reactive uranyl salt source material at cryogenic temperatures, followed by chemical separation of selectively photochemically reduced U+4 thereby produced from remaining uranyl source material.
Inventors
- 👤 II John T. Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:47
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/121; B01D; B01D59/00; B01D59/34
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
157 words
A method for separating uranium isotopes comprising the steps of providing a solid, crystalline, uranyl salt source material which is photochemically reactive to reduce uranyl cations of said uranyl salt source material to tetravalent uranium ions, selectively irradiating said photochemically reactive uranyl source material at an electronic absorption wavelength in the range of from about 20,000 to about 27,000 cm -1 which is selective to a desired isotope of said uranyl source material at an effective cryogenic temperature for isotope spectral line splitting below about 77° K. without substantial photochemical reduction of the source material, further irradiating said source material within the fluorescent lifetime of the selectively irradiated source material at a vibrational absorption wavelength of a bond of atoms or an ionic group respectively adjacent the uranyl cations of the electronically excited source material to selectively photochemically reduce the selectively excited isotopic species, and chemically separating the reduced isotope species from the remaining uranyl salt compound.
Claim 2
Independent Claim
157 words
A method for separating uranium isotopes comprising the steps of providing a solid, crystalline, uranyl salt source material which is photochemically reactive to reduce uranyl cations of said uranyl salt source material to tetravalent uranium ions, selectively irradiating said photochemically reactive uranyl source material at an electronic absorption wavelength in the range of from about 20,000 to about 27,000 cm -1 which is selective to a desired isotope of said uranyl source material at an effective cryogenic temperature for isotope spectral line splitting below about 77° K. without substantial photochemical reduction of the source material, further irradiating said source material within the fluorescent lifetime of the selectively irradiated source material at a vibrational absorption wavelength of a bond of atoms or an ionic group respectively adjacent the uranyl cations of the electronically excited source material to selectively photochemically reduce the selectively excited isotopic species, and chemically separating the reduced isotope species from the remaining uranyl salt compound.
Claim 3
Dependent Claim
26 words
A method in accordance with claim 1 wherein said vibrational excitation wavelength is an infrared absorption wavelength of an anionic moiety of said uranyl source material.
Claim 4
Dependent Claim
44 words
A method in accordance with claim 1 wherein said uranyl source material is a mixed salt including at least one cationic moiety in addition to a uranyl cationic moiety and wherein said vibrational absorption wavelength is an infrared absorption wavelength of said cationic moiety.
Claim 5
Dependent Claim
17 words
A method in accordance with claim 1 wherein said crystalline source material contains a formate anion species.
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) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |