Patent US2992703A successfully refreshed from Google Patents.
US2992703A
Expired / Lapsed
US
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Separation of carbon dioxide from ammonia
Assignee: Individual
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Filing: 1958-06-05
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Granted: 1961-07-18
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Expires: 1978-06-05
Abstract
No abstract record available.
Inventors
- 👤 Vasan Srini
- 👤 Lucien H Cook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:43
CPC Classifications
C; C01; C01C; C01C1/00; C01C1/02; C01C1/12; C01B; C01B32/00; C01B32/50; Y; Y10; Y10S; Y10S95/00; Y10S95/90; Y10S95/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
THE METHOD OF REMOVING CARBON DIOXIDE FROM A MIXTURE OF AMMONIA AND CARBON DIOXIDE IN WHICH THE CARBON DIOXIDE IS PRESENT THEREIN IN AN AMOUNT IN EXCESS OF 2 PARTS PER MILLION BY VOLUME BUT NOT GREATER THAN 5/ PARTS PER MILLION BY VOLUME, WHICH COMPRISES PASSING SAID GAS MIXTURE THROUGH A MOLECULAR SIEVE COMPRISING A BED OF ACTIVATED ZEOLITE HAVING VOIDS WHOSE NARROWEST DIMENSION IS AT LEAST 4 ANGSTROM UNITS IN LENGTH TO PREFERENTIALLY ADSORB THE CARBON DIOXIDE, CONTINUING ADSORPTION UNTIL THE CARBON DIOXIDE, CONTINUING ADSORPTION UNHEATING THE ZEOLITE BED BY INDIRECT HEATING MEANS IN ADDITION TO A COUNTERCURRENT FLOW OF A PORTION OF THE PURIFIED AMMONIA WHICH HAS BEEN HEATED TO REGENERATE THE ZEOLITIC ADSORBENT BED, THEREAFTER COOLING THE ADSORBENT BED WITH A COOL CARBON DIOXIDE-FREE AMMONIA GAS.
Claim 2
Independent Claim
130 words
THE METHOD OF REMOVING CARBON DIOXIDE FROM A MIXTURE OF AMMONIA AND CARBON DIOXIDE IN WHICH THE CARBON DIOXIDE IS PRESENT THEREIN IN AN AMOUNT IN EXCESS OF 2 PARTS PER MILLION BY VOLUME BUT NOT GREATER THAN 5/ PARTS PER MILLION BY VOLUME, WHICH COMPRISES PASSING SAID GAS MIXTURE THROUGH A MOLECULAR SIEVE COMPRISING A BED OF ACTIVATED ZEOLITE HAVING VOIDS WHOSE NARROWEST DIMENSION IS AT LEAST 4 ANGSTROM UNITS IN LENGTH TO PREFERENTIALLY ADSORB THE CARBON DIOXIDE, CONTINUING ADSORPTION UNTIL THE CARBON DIOXIDE, CONTINUING ADSORPTION UNHEATING THE ZEOLITE BED BY INDIRECT HEATING MEANS IN ADDITION TO A COUNTERCURRENT FLOW OF A PORTION OF THE PURIFIED AMMONIA WHICH HAS BEEN HEATED TO REGENERATE THE ZEOLITIC ADSORBENT BED, THEREAFTER COOLING THE ADSORBENT BED WITH A COOL CARBON DIOXIDE-FREE AMMONIA GAS.
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) | 1964-07-17 | 1965-01-16 | 1965-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-17 | 1969-01-16 | 1969-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-17 | 1973-01-16 | 1973-07-18 | $7700.00 | Window Closed / Lapsed |