US2889205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of separating nitrogen isotopes by ion-exchange
Assignee: IOWA STATE COLLEGE RES FOUND
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Filing: 1956-02-29
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Granted: 1959-06-02
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Expires: 1976-02-29
Abstract
No abstract record available.
Inventors
- 👤 Frank H Spedding
- 👤 Jack E Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:38
CPC Classifications
B; B01; B01J; B01J39/00; B01J39/26; B01D; B01D59/00; B01D59/28; B01D59/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
THE METHOD OF SEPARATING NITROGEN ISOTOPES BY IONEXCHANGEM CHARACTERIZED BY THE STEPS OF PASSING AN AQUEOUS SOLUTION OF A,,ONIUM HYDROXIDE THROUGH A PORTION OF A STRONG ACID CATION EXCHANGE RESIN IN THE HYDROGEN CYCLE T PROVIDE AN ADSOPBED AMMONIUM BAND HAVING A SHARPLY-DEFINED FRONT BOUNDARY, SAID RESIN BEING SUBSTANTIALLY UNIFORMLY PACKED IN AN ELONGATED COLUMN, SAID AMMONIUM HYDROXIDE PROVIDING BOTH N15 AND N14 AMMONIUM IONS, THEN ELUTING THE ADSORBED AMMONIA WHILE DISPLACING SAID BAND TO SUCCESSIVE PORTIONS OF A CATION EXCHANGE MATERIAL IN THE HYGROGEN CYCLE BY PASSING AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE THROUGH THE CATION EXCHANGE MATERIAL BAHIND SAID BAND, THEREBY MAINATAINING A SHARPLY-DEFINED REAR BOUNDARY FOR SAID BAND, AND CONTINUING SAID ELUTING AND DISPLACING UNTIL THE REAR PORTION OF SAID BAND CONTAIN AN APPRECIABLY HIGHER RATIO OF N15 AMMONIA TO N14 AMMONIA THAN THE FRONT PORTION OF SAID BAND, SAID AMMONIUM HYDROXIDE SOLSUTION HAVING A NORMASLLY RANGING FROM 0.01 NORMAL TO 3.0 NORMAL AND SAID ALKALI METAL HYDROXIDE SOLUSTION HAVING A NORMALLY RANGING FROM 0.01 NORMAL TO 3.0 NORMAL.
Claim 2
Independent Claim
174 words
THE METHOD OF SEPARATING NITROGEN ISOTOPES BY IONEXCHANGEM CHARACTERIZED BY THE STEPS OF PASSING AN AQUEOUS SOLUTION OF A,,ONIUM HYDROXIDE THROUGH A PORTION OF A STRONG ACID CATION EXCHANGE RESIN IN THE HYDROGEN CYCLE T PROVIDE AN ADSOPBED AMMONIUM BAND HAVING A SHARPLY-DEFINED FRONT BOUNDARY, SAID RESIN BEING SUBSTANTIALLY UNIFORMLY PACKED IN AN ELONGATED COLUMN, SAID AMMONIUM HYDROXIDE PROVIDING BOTH N15 AND N14 AMMONIUM IONS, THEN ELUTING THE ADSORBED AMMONIA WHILE DISPLACING SAID BAND TO SUCCESSIVE PORTIONS OF A CATION EXCHANGE MATERIAL IN THE HYGROGEN CYCLE BY PASSING AN AQUEOUS SOLUTION OF AN ALKALI METAL HYDROXIDE THROUGH THE CATION EXCHANGE MATERIAL BAHIND SAID BAND, THEREBY MAINATAINING A SHARPLY-DEFINED REAR BOUNDARY FOR SAID BAND, AND CONTINUING SAID ELUTING AND DISPLACING UNTIL THE REAR PORTION OF SAID BAND CONTAIN AN APPRECIABLY HIGHER RATIO OF N15 AMMONIA TO N14 AMMONIA THAN THE FRONT PORTION OF SAID BAND, SAID AMMONIUM HYDROXIDE SOLSUTION HAVING A NORMASLLY RANGING FROM 0.01 NORMAL TO 3.0 NORMAL AND SAID ALKALI METAL HYDROXIDE SOLUSTION HAVING A NORMALLY RANGING FROM 0.01 NORMAL TO 3.0 NORMAL.
References Cited (Backward Citations)
US2204072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |