US2824428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for separating air
Assignee: Union Carbide Corp
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Filing: 1957-03-19
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Granted: 1958-02-25
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Expires: 1977-03-19
Abstract
No abstract record available.
Inventors
- 👤 Edward F Yendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:16
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04642; F25J3/04648; F25J3/04654; F25J3/04666; F25J3/04672; F25J3/04678; F25J3/04151; F25J3/04242; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04303; F25J3/0446; F25J2200/00; F25J2200/04; F25J2205/00; F25J2205/30; F25J2235/00; F25J2235/50; F25J2250/00; F25J2250/30; F25J2250/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS FOR SEPARATING AIR BY LOW TEMPERATURE RECTIFICATION INTO PRODUCTS INCLUDING AN ARGON-ENRICHED PRODUCT WHICH COMPRISES SUBJECTING AIR TO COOLING AND LIQUEFYING HEAT EXCHANGES INCLUDING A RECTIFICATION AT A HIGHER RECTIFICATION PRESSURE TO PROVIDE LIQUID FEEDS FOR A MAIN RECTIFICATION AT A LOWER PRESSURE, SAID FEEDS INCLUDING AN OXYGEN-ENRICHED LIQUID CONTAINING A SUBSTANTIAL PART OF THE ARGON AND A NITROGEN-RICH LIQUID CONTAINING A MINOR AMOUNT OF THE ARGON, FEEDING THE OXYGEN-ENRICHED LIQUID TO AN INTERMEDIATE FEED POINT LEVEL OF SAID MAIN RECTIFICATION AFTER EXPANSION TO SAID LOWER PRESSURE, FEEDING THE NITROGEN-RICH LIQUID TO A HIGHER FEED POINT LEVEL OF SAID MAIN RECTIFICATION AFTER EXPANSION TO SAID LOWER PRESSURE, WITHDRAWING AN ARGON-CONTAINING VAPOR FROM A LEVEL OF SAID MAIN RECTIFICATION BELOW SAID INTERMEDIATE FEED POINT AND PASSING IT TO AN AUXILIARY RECTIFICATIONS,
Claim 2
Dependent Claim
132 words
A PROCESS FOR SEPARATING AIR BY LOW TEMPERATURE RECTIFICATION INTO PRODUCTS INCLUDING AN ARGON-ENRICHED PRODUCT WHICH COMPRISES SUBJECTING AIR TO COOLING AND LIQUEFYING HEAT EXCHANGES INCLUDING A RECTIFICATION AT A HIGHER RECTIFICATION PRESSURE TO PROVIDE LIQUID FEEDS FOR A MAIN RECTIFICATION AT A LOWER PRESSURE, SAID FEEDS INCLUDING AN OXYGEN-ENRICHED LIQUID CONTAINING A SUBSTANTIAL PART OF THE ARGON AND A NITROGEN-RICH LIQUID CONTAINING A MINOR AMOUNT OF THE ARGON, FEEDING THE OXYGEN-ENRICHED LIQUID TO AN INTERMEDIATE FEED POINT LEVEL OF SAID MAIN RECTIFICATION AFTER EXPANSION TO SAID LOWER PRESSURE, FEEDING THE NITROGEN-RICH LIQUID TO A HIGHER FEED POINT LEVEL OF SAID MAIN RECTIFICATION AFTER EXPANSION TO SAID LOWER PRESSURE, WITHDRAWING AN ARGON-CONTAINING VAPOR FROM A LEVEL OF SAID MAIN RECTIFICATION BELOW SAID INTERMEDIATE FEED POINT AND PASSING IT TO AN AUXILIARY RECTIFICATIONS,
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) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |