Patent US4490225A successfully refreshed from Google Patents.
US4490225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of isotopes of zirconium
Assignee: Westinghouse Electric Corp
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Filing: 1982-09-07
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Granted: 1984-12-25
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Expires: 2002-09-07
Abstract
Abstract Vapor of dicyclopentadienyl zirconium dicyanate is irradiated by a laser beam of a CO 2 laser tuned to the stretching frequency of the S Zr-O-C bond of the dicyanate where S Zr is a selected isotope of zirconium. The excited component of the irradiated dicyanate including the S Zr is decomposed and is separated from the remainder. The dicyanate is readily prepared in large quantities, resists hydrolysis, sublimes at a temperature well below its dissociation temperature, and has a lower molecular weight than other proposed compounds such as dicyclopentadienyl zirconium diisopropoxide, and dicyclopentadienyl zirconium-di-tert-butoxide
Inventors
- 👤 Edward J. Lahoda
- 👤 Sharon L. Weisberg
- 👤 Robert W. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:30
CPC Classifications
B; B01; B01D; B01D59/00; B01D59/34
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
The method of producing zirconium having a low neutron-absorption cross section for use in parts of a nuclear reactor, the said method comprising producing a material of dicyclopentadienyl zirconium dicyanate, (Cp) 2 Zr(OCN) 2 , said material containing a plurality of isotopes of zirconium, subjecting the vapor of said material to radiation emitted from a carbon-dioxide laser tuned to the vibration of an excitable bond of a selected S Zr isotope of said material, whereby the S Zr component of said material is decomposed; separating the product of the decomposition of the S Zr component from the remainder of said material, and forming the said parts of that one, of the separated S Zr component of said material or of the remainder of said material, in which the zirconium has the minimum neutron-absorption cross section.
Claim 2
Independent Claim
135 words
The method of producing zirconium having a low neutron-absorption cross section for use in parts of a nuclear reactor, the said method comprising producing a material of dicyclopentadienyl zirconium dicyanate, (Cp) 2 Zr(OCN) 2 , said material containing a plurality of isotopes of zirconium, subjecting the vapor of said material to radiation emitted from a carbon-dioxide laser tuned to the vibration of an excitable bond of a selected S Zr isotope of said material, whereby the S Zr component of said material is decomposed; separating the product of the decomposition of the S Zr component from the remainder of said material, and forming the said parts of that one, of the separated S Zr component of said material or of the remainder of said material, in which the zirconium has the minimum neutron-absorption cross section.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the vapor is produced by heating the material to a temperature of between 170° C. and 180° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |