Patent US3021682A successfully refreshed from Google Patents.
US3021682A
Expired / Lapsed
US
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Process and apparatus for purifying low boiling gases
Assignee: Union Carbide Corp
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Filing: 1960-10-12
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Granted: 1962-02-20
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Expires: 1980-10-12
Abstract
No abstract record available.
Inventors
- 👤 Charles R Baker
- 👤 Richard S Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:52
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0228; F25J3/028; F25J3/029; F25J3/0204; F25J3/0209; F25J3/0219; F25J3/0252; F25J3/08; F25J2205/00; F25J2205/30; F25J2205/50; F25J2210/00; F25J2210/12; F25J2215/00; F25J2215/10; F25J2215/30; F25J2215/32; F25J2270/00; F25J2270/12; F25J2270/42; Y; Y10; Y10S; Y10S62/00; Y10S62/923; Y10S62/927
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A PROCESS FOR THE LOW-TEMPERATURE SEPARATION OF NITROGEN LOWER BOILING IMPURITY FROM A GAS MIXTURE HAVING A MAJOR CONSTITUENT BOILING BELOW ABOUT -245* C. INCLUDING THE STEPS OF PROVIDING A FEED STREAM INCLUDING THE MAJOR CONSTITUENT AND CONTAINING MINOR AMOUNTS OF SUCH LOWER BOILING IMPURITY AT A SUBSTANTIAL WORKING PRESSURE AND A LOW TEMPERATURE BELOW -180*C.; PROVIDING A SUBCOOLED WASH LIQUID AT ABOUT SAID LOW TEMPERATURE AND SAID WORKING PRESSURE, SUCH LIQUID HAVING A VAPOR PRESSURE LESS THAN APPROXIMATELY ONE FIVE-HUNDRETHS OF THE VAPOR PRESSURE OF NITROGEN AT SUCH TEMPERATURE; WASHING THE COLD GASEOUS FEED STREAM WITH THE WASH LIQUID THEREBY TRANSFERRING SUBSTANTIALLY ALL OF THE NITROGEN LOWER BOILING IMPURITY TO THE WASH LIQUID BY ABSORPTION THEREIN; REMOVING THE LOWER BOILING IMPURITY FROM THE CONTAMINATED WASH LIQUID AND RECYCLING SUCH CLEANED WASH LIQUID FOR RE-USE IN THE WASHING STEP.
Claim 2
Dependent Claim
139 words
A PROCESS FOR THE LOW-TEMPERATURE SEPARATION OF NITROGEN LOWER BOILING IMPURITY FROM A GAS MIXTURE HAVING A MAJOR CONSTITUENT BOILING BELOW ABOUT -245* C. INCLUDING THE STEPS OF PROVIDING A FEED STREAM INCLUDING THE MAJOR CONSTITUENT AND CONTAINING MINOR AMOUNTS OF SUCH LOWER BOILING IMPURITY AT A SUBSTANTIAL WORKING PRESSURE AND A LOW TEMPERATURE BELOW -180*C.; PROVIDING A SUBCOOLED WASH LIQUID AT ABOUT SAID LOW TEMPERATURE AND SAID WORKING PRESSURE, SUCH LIQUID HAVING A VAPOR PRESSURE LESS THAN APPROXIMATELY ONE FIVE-HUNDRETHS OF THE VAPOR PRESSURE OF NITROGEN AT SUCH TEMPERATURE; WASHING THE COLD GASEOUS FEED STREAM WITH THE WASH LIQUID THEREBY TRANSFERRING SUBSTANTIALLY ALL OF THE NITROGEN LOWER BOILING IMPURITY TO THE WASH LIQUID BY ABSORPTION THEREIN; REMOVING THE LOWER BOILING IMPURITY FROM THE CONTAMINATED WASH LIQUID AND RECYCLING SUCH CLEANED WASH LIQUID FOR RE-USE IN THE WASHING STEP.
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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) | 1965-02-19 | 1965-08-21 | 1966-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-19 | 1969-08-21 | 1970-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-19 | 1973-08-21 | 1974-02-20 | $7700.00 | Window Closed / Lapsed |