Patent US2700282A successfully refreshed from Google Patents.
US2700282A
Expired / Lapsed
US
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Fractional separation of air
Assignee: BOC Group Ltd
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Filing: 1951-06-04
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Granted: 1955-01-25
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Expires: 1971-06-04
Abstract
No abstract record available.
Inventors
- 👤 Roberts Neville Wyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:51
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04248; F25J3/04333; F25J3/04339; F25J3/04345; F25J3/04351; F25J3/04357; F25J3/044; F25J3/04642; F25J3/04648; F25J3/04654; F25J3/0466; F25J3/04709; F25J3/04715; F25J2200/00; F25J2200/08; F25J2200/50; F25J2200/76; F25J2235/00; F25J2235/50; Y; Y10; Y10S; Y10S62/00; Y10S62/923; Y10S62/924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR SEPARATING ARGON FROM AIR WHICH COMPRISES TREATING THE AIR IN A PRIMARY RECTIFICATION ZONE IN SUCH A MANNER AS TO PRODUCE THEREIN A LIQUID OXYGEN ARGON FRACTION AND A GASEOUS NITROGEN FRACTION, MECHANICALLY INCREASING THE PRESSURE OF AT LEAST A PART OF SUCH LIQUID OXYGEN-ARGON FRACTION AND TRANSFERRING IT TO A SECONDARY RECTIFICATION ZONE WHICH OPERATES UNDER ELEVATED PRESSURE WHEREIN IT IS SEPARATED INTO AN ARGON-RICH FRACTION AND A SUBSTANTIALLY PURE OXYGEN FRACTION, AND MAINTAINING THE NECESSARY TEMPERATURE GRADIENT IN THE SAID SECONDARY RECTIFICATION ZONE BY THE CONDENSATION AND REVAPORISATION BY INDIRECT HEAT EXCHANGE THERIN OF AT LEAST A PART OF THE SAID GASEOUS NITROGEN FRACTION SEPARATED IN THE SAID PRIMARY RECTIFICATION ZONE, THE REVAPORISATION TAKING PLACE AT SUCH A PRESSURE THAT THE VAPORISED NITROGEN FRACTION ACTS AS REFLUX MEDIUM IN THE PRIMARY RECTIFICATION ZONE.
Claim 2
Dependent Claim
138 words
A PROCESS FOR SEPARATING ARGON FROM AIR WHICH COMPRISES TREATING THE AIR IN A PRIMARY RECTIFICATION ZONE IN SUCH A MANNER AS TO PRODUCE THEREIN A LIQUID OXYGEN ARGON FRACTION AND A GASEOUS NITROGEN FRACTION, MECHANICALLY INCREASING THE PRESSURE OF AT LEAST A PART OF SUCH LIQUID OXYGEN-ARGON FRACTION AND TRANSFERRING IT TO A SECONDARY RECTIFICATION ZONE WHICH OPERATES UNDER ELEVATED PRESSURE WHEREIN IT IS SEPARATED INTO AN ARGON-RICH FRACTION AND A SUBSTANTIALLY PURE OXYGEN FRACTION, AND MAINTAINING THE NECESSARY TEMPERATURE GRADIENT IN THE SAID SECONDARY RECTIFICATION ZONE BY THE CONDENSATION AND REVAPORISATION BY INDIRECT HEAT EXCHANGE THERIN OF AT LEAST A PART OF THE SAID GASEOUS NITROGEN FRACTION SEPARATED IN THE SAID PRIMARY RECTIFICATION ZONE, THE REVAPORISATION TAKING PLACE AT SUCH A PRESSURE THAT THE VAPORISED NITROGEN FRACTION ACTS AS REFLUX MEDIUM IN THE PRIMARY RECTIFICATION ZONE.
References Cited (Backward Citations)
US1638005A
Cited
US1619909A
Cited
US1880981A
Cited
US2101300A
Cited
US2423274A
Cited
US2482304A
Cited
US2567461A
Cited
US2545462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-24 | 1958-07-26 | 1959-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-24 | 1962-07-26 | 1963-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-24 | 1966-07-26 | 1967-01-25 | $7700.00 | Window Closed / Lapsed |