US3947335A
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Isotope separation by selective photodissociation of glyoxal
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-03-04
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Granted: 1976-03-30
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Expires: 1995-03-04
Abstract
Abstract Dissociation products, mainly formaldehyde and carbon monoxide, enriched in a desired isotope of carbon, oxygen, or hydrogen are obtained by the selective photodissociation of glyoxal wherein glyoxal is subjected to electromagnetic radiation of a predetermined wavelength such that photon absorption excites and induces dissociation of only those molecules of glyoxal containing the desired isotope.
Inventors
- 👤 John B. Marling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:19
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/08; B01J19/12; B01J19/121
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
A method of separating isotopes which comprises subjecting glyoxal vapor to electromagnetic radiation having a predetermined wavelength such that photon absorption selectively excites molecules of glyoxal containing a desired isotope of carbon, oxygen, or hydrogen and induces dissociation of the selectively excited molecules into a product enriched in the desired isotope, and separating the isotopically enriched dissociation product from the reaction mixture.
Claim 2
Independent Claim
62 words
A method of separating isotopes which comprises subjecting glyoxal vapor to electromagnetic radiation having a predetermined wavelength such that photon absorption selectively excites molecules of glyoxal containing a desired isotope of carbon, oxygen, or hydrogen and induces dissociation of the selectively excited molecules into a product enriched in the desired isotope, and separating the isotopically enriched dissociation product from the reaction mixture.
Claim 3
Dependent Claim
13 words
A method according to claim 1 wherein the electromagnetic radiation is laser radiation.
Claim 4
Dependent Claim
21 words
A method according to claim 1 wherein the predetermined wavelength is in the range of from about 3500A to about 4600A.
Claim 5
Dependent Claim
21 words
A method according to claim 3 wherein the predetermined wavelength is in the range of from about 4300A to about 4600A.
Claim 6
Dependent Claim
15 words
A method according to claim 1 wherein the dissociation product comprise formaldehyde and carbon monoxide.
Claim 7
Dependent Claim
21 words
A method according to claim 1 wherein the desired isotope is deuterium and the dissociation product comprises formaldehyde enriched in deuterium.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |