Patent US2934908A successfully refreshed from Google Patents.
US2934908A
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High argon recovery using proper shelf-top pinch principle
Assignee: Union Carbide Corp
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Filing: 1954-08-16
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Granted: 1960-05-03
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Expires: 1974-08-16
Abstract
No abstract record available.
Inventors
- 👤 Robert E Latimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:47
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04406; F25J3/04412; F25J3/04642; F25J3/04648; F25J3/04654; F25J3/04666; F25J3/04672; F25J3/04678; F25J3/04763; F25J3/04769; F25J3/04793; F25J3/048; F25J2235/00; F25J2235/52; F25J2245/00; F25J2245/02; Y; Y10; Y10S; Y10S62/00; Y10S62/923; Y10S62/924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A PROCESS FOR THE SEPARATION OF AIR BY LOW TEMPERATURE RECTIFICATION TO OBTAIN OXYGEN, ARGON AND NITROGEN WHICH COMPRISES: SUBJECTING AIR TO A TWO-STAGE RECTIFICATION WHEREIN NITROGEN-RICH REFLUX LIQUID AND OXYGEN-ENRICHED FLUX LIQUID ARE INTRODUCED INTO THE SECOND RECTIFICATION STAGE AND WHEREIN AN OXYGEN PRODUCT AND A NITROGEN PRODUCT ARE FORMED, WASHING THE RISING VAPOR AT THE TOP PORTION OF THE SECOND RECTIFICATION STAGE WITH NITROGEN-RICH REFLUX LIQUID HAVING SUCH A COMPOSITION AS TO BE IN OXYGEN NITROGEN PHASE EQUILIBRIUM WITH THE VAPOR AT THE REFLUX LIQUID FEED POINT TO PRODUCE AN OXYGEN PINCH AT THE TOP
Claim 2
Dependent Claim
97 words
A PROCESS FOR THE SEPARATION OF AIR BY LOW TEMPERATURE RECTIFICATION TO OBTAIN OXYGEN, ARGON AND NITROGEN WHICH COMPRISES: SUBJECTING AIR TO A TWO-STAGE RECTIFICATION WHEREIN NITROGEN-RICH REFLUX LIQUID AND OXYGEN-ENRICHED FLUX LIQUID ARE INTRODUCED INTO THE SECOND RECTIFICATION STAGE AND WHEREIN AN OXYGEN PRODUCT AND A NITROGEN PRODUCT ARE FORMED, WASHING THE RISING VAPOR AT THE TOP PORTION OF THE SECOND RECTIFICATION STAGE WITH NITROGEN-RICH REFLUX LIQUID HAVING SUCH A COMPOSITION AS TO BE IN OXYGEN NITROGEN PHASE EQUILIBRIUM WITH THE VAPOR AT THE REFLUX LIQUID FEED POINT TO PRODUCE AN OXYGEN PINCH AT THE TOP
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) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |