Patent US3457041A successfully refreshed from Google Patents.
US3457041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the enrichment of deuterium
Assignee: Yeda Research and Development Co Ltd
•
Filing: 1967-05-11
•
Granted: 1969-07-22
•
Expires: 1987-05-11
Abstract
No abstract record available.
Inventors
- 👤 Fritz S Klein
- 👤 Kedma Bar-Eli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:38
CPC Classifications
B; B01; B01D; B01D59/00; B01D59/28; B01D59/32; C; C01; C01B; C01B4/00; C01B5/00; C01B5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN A PROCESS FOR THE ISOTOPIC ENRICHMENT OF AN EXCHANGE AGENT WITH DEUTERIUM BY BI-THERMAL ISOTOPIC EXCHANGE BETWEEN A GASEOUS STREAM CONTAINING HYDROGEN AND A LIQUID STREAM CONTAINING SAID EXCHANGE AGENT AND A CATALYST FOR STRIPPING DEUTERIUM FROM SAID GASEOUS STREAM, THE IMPROVEMENT COMPRISING EMPLOYING AS SAID EXCHANGE AGENT AN ALIPHATIC AMINE HAVING THE FORMULA RR''NH, WHEREIN R IS HYDROGEN OR A LOWER ALKYL RADICAL HAVING FROM 1 TO 5 CARBON ATOMS AND R'' IS A LOWER ALKYL RADICAL HAVING FROM 1 TO 5 CARBON ATOMS, AND EMPLOYING AS SAID CATALYST AN ALKALI METAL AMIDE HAVING THE FORMULA MNRR'', WHEREIN M IS AN ALKALI METAL ATOM AND R AND R'' ARE AS DEFINED ABOVE.
Claim 2
Dependent Claim
114 words
IN A PROCESS FOR THE ISOTOPIC ENRICHMENT OF AN EXCHANGE AGENT WITH DEUTERIUM BY BI-THERMAL ISOTOPIC EXCHANGE BETWEEN A GASEOUS STREAM CONTAINING HYDROGEN AND A LIQUID STREAM CONTAINING SAID EXCHANGE AGENT AND A CATALYST FOR STRIPPING DEUTERIUM FROM SAID GASEOUS STREAM, THE IMPROVEMENT COMPRISING EMPLOYING AS SAID EXCHANGE AGENT AN ALIPHATIC AMINE HAVING THE FORMULA RR''NH, WHEREIN R IS HYDROGEN OR A LOWER ALKYL RADICAL HAVING FROM 1 TO 5 CARBON ATOMS AND R'' IS A LOWER ALKYL RADICAL HAVING FROM 1 TO 5 CARBON ATOMS, AND EMPLOYING AS SAID CATALYST AN ALKALI METAL AMIDE HAVING THE FORMULA MNRR'', WHEREIN M IS AN ALKALI METAL ATOM AND R AND R'' ARE AS DEFINED ABOVE.
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) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |