US2788646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of and apparatus for lowtemperature separation of air
Assignee: Union Carbide Corp
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Filing: 1953-03-24
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Granted: 1957-04-16
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Expires: 1973-03-24
Abstract
No abstract record available.
Inventors
- 👤 Philip K Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:09
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04151; F25J3/04242; F25J3/04248; F25J3/04254; F25J3/04284; F25J3/0429; F25J3/04303; F25J3/04406; F25J3/04412; F25J3/04472; F25J3/04478; F25J3/04496; F25J3/04763; F25J3/04769; F25J3/04812; F25J3/04836; F25J3/04866; F25J3/04951; F25J3/04957; F25J2205/00; F25J2205/24; F25J2205/30; F25J2205/60; F25J2210/00; F25J2210/50; F25J2215/00; F25J2215/02; F25J2215/50; F25J2230/00; F25J2230/24; F25J2230/40; F25J2235/00; F25J2235/50; F25J2245/00; F25J2245/40; F25J2250/00; F25J2250/30; F25J2250/50; F25J2290/00; F25J2290/62; Y; Y10; Y10S; Y10S62/00; Y10S62/912; Y10S62/913
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
IN A PROCESS FOR SUPPLYING OXYGEN TO A CONSUMER SYSTEM HAVING A VARIABLE DEMAND FOR SAME INCLUDING PERIODS OF NORMAL DEMAND AND OF DEMAND IN EXCESS OF THE NORMAL AND INCLUDING THE LOW-TEMPERATURE SEPARATION OF AIR BY RECTIFICATION IN WHICH AIR COOLED AND FREED OF MOISTURE AND CARBON DIOXIDE IS SUBJECTED TO LOW-TEMPERATURE RECTIFICATION TO SEPARATE OXYGEN AND NITROGEN RICH PRODUCTS, WHICH PRODUCTS ARE USED TO COOL FURTHER PORTIONS OF AIR, THE STEPS OF PROVIDING A STORE OF LIQUID COMPRISING MAINLY OXYGEN; HOLDING SAID STORE OF LIQUID SEPARATE FROM THE LIQUIDS INVOLVED IN THE RECTIFICATION; DURING CONTINUOUS RECTIFYING OPERATION, UTILIZING PORTIONS OF SAID STORE OF LIQUID TO PRODUCE REFRIGERATION FOR THE RECTIFICATION AT A RATE SUFFICIENT TO PROVIDE THE LOW-TEMPERATURE REFRIGERATION REQUIREMENTS OF THE AIR SEPARATION IN EXCESS OF THAT GAINED
Claim 2
Dependent Claim
131 words
IN A PROCESS FOR SUPPLYING OXYGEN TO A CONSUMER SYSTEM HAVING A VARIABLE DEMAND FOR SAME INCLUDING PERIODS OF NORMAL DEMAND AND OF DEMAND IN EXCESS OF THE NORMAL AND INCLUDING THE LOW-TEMPERATURE SEPARATION OF AIR BY RECTIFICATION IN WHICH AIR COOLED AND FREED OF MOISTURE AND CARBON DIOXIDE IS SUBJECTED TO LOW-TEMPERATURE RECTIFICATION TO SEPARATE OXYGEN AND NITROGEN RICH PRODUCTS, WHICH PRODUCTS ARE USED TO COOL FURTHER PORTIONS OF AIR, THE STEPS OF PROVIDING A STORE OF LIQUID COMPRISING MAINLY OXYGEN; HOLDING SAID STORE OF LIQUID SEPARATE FROM THE LIQUIDS INVOLVED IN THE RECTIFICATION; DURING CONTINUOUS RECTIFYING OPERATION, UTILIZING PORTIONS OF SAID STORE OF LIQUID TO PRODUCE REFRIGERATION FOR THE RECTIFICATION AT A RATE SUFFICIENT TO PROVIDE THE LOW-TEMPERATURE REFRIGERATION REQUIREMENTS OF THE AIR SEPARATION IN EXCESS OF THAT GAINED
References Cited (Backward Citations)
US1890646A
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US2105214A
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US2180090A
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US2180715A
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US2664718A
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US2601764A
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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) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |