Patent US4220510A successfully refreshed from Google Patents.
US4220510A
Expired / Lapsed
US
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Method for separating isotopes in the liquid phase at cryogenic temperature
Assignee: Massachusetts Institute of Technology
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Filing: 1978-07-13
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Granted: 1980-09-02
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Expires: 1998-07-13
Abstract
Abstract Isotopes are separated from an isotopically mixed molecular dopant dissolved in a cryogenic liquid. The solution is exposed to infrared laser light in order to selectively vibrationally excite a particular molecular species which contains the isotope or isotopes that are to be separated. The excited species then is reacted or dissociated to form recoverable reaction products rich in the isotope desired.
Inventors
- 👤 Steven R. J. Brueck
- 👤 Richard M. Osgood, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:43
CPC Classifications
B; B01; B01D; B01D59/00; B01D59/34; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/121
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A process for separating isotopes from an isotopic mixture of a compound dissolved in a cryogenic liquid at a temperature less than about 100° K., which comprises exposing the solution to infrared laser radiation having a radiation frequency that causes excitation of the vibrational energy of a first isotopic molecule of said mixture without exciting the vibrational energy of molecules containing other isotopic forms in said mixture, reacting the compounds containing said vibrationally excited isotopic molecules with a second compound in said liquid or dissociating the compounds containing said vibrationally excited isotopic molecules and separating the products of said reaction or dissociation containing said first isotopic molecules.
Claim 2
Dependent Claim
107 words
A process for separating isotopes from an isotopic mixture of a compound dissolved in a cryogenic liquid at a temperature less than about 100° K., which comprises exposing the solution to infrared laser radiation having a radiation frequency that causes excitation of the vibrational energy of a first isotopic molecule of said mixture without exciting the vibrational energy of molecules containing other isotopic forms in said mixture, reacting the compounds containing said vibrationally excited isotopic molecules with a second compound in said liquid or dissociating the compounds containing said vibrationally excited isotopic molecules and separating the products of said reaction or dissociation containing said first isotopic molecules.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the selective vibrational excitation is accomplished by means of a two-photon absorption band.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein said compound containing the vibrationally excited isotope is reacted with a second compound dissolved in said cryogenic liquid.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein dissociation of said vibrationally excited molecule is effected by exposure to ultraviolet radiation.
Claim 6
Dependent Claim
20 words
The process of claim 4 wherein said ultraviolet radiation is generated by exposure of said solution to said laser light.
Claim 7
Dependent Claim
33 words
The process of claim 4 wherein said cryogenic liquid is exposed simultaneously to said infrared radiation and said ultraviolet radiation wherein said laser radiation and said ultraviolet radiation are generated from separate sources.
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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |