US2708831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of air
Assignee: Airco Inc
•
Filing: 1953-04-09
•
Granted: 1955-05-24
•
Expires: 1973-04-09
Abstract
No abstract record available.
Inventors
- 👤 Wilkinson Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:46
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; F25J3/04006; F25J3/04078; F25J3/0409; F25J3/04151; F25J3/04187; F25J3/04193; F25J3/042; F25J3/04218; F25J3/04242; F25J3/04248; F25J3/04284; F25J3/0429; F25J3/04296; F25J3/04333; F25J3/04351; F25J3/04406; F25J3/04412; F25J3/04472; F25J3/04496; F25J3/04503; F25J3/04509; F25J2200/00; F25J2200/32; F25J2205/00; F25J2205/30; F25J2220/00; F25J2220/44; F25J2245/00; F25J2245/42; F25J2250/00; F25J2250/30; F25J2250/40; F25J2250/42; Y; Y10; Y10S; Y10S62/00; Y10S62/912; Y10S62/913
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
IN AN AIR SEPARATION PROCESS WHICH PRODUCES LIQUID OXYGEN FROM AIR USING LIQUID NITROGEN REFLUX AND THEN PUMPS AND GASIFIED LIQUID OXYGEN TO HIGH PRESSURE BY HEAT EXCHANGE WITH A PROCESS STREAM, THE IMPROVEMENT WHICH COMPRISES UTILIZING THE REFRIGERATION RECOVERED IN GASIFYING MORE THAN THE REGULAR PRODUCTION OF LIQUID OXYGEN WHICH IS TO BE GASIFIED TO PRODUCE A RESERVE OF LIQUID NITROGEN AND SUBSEQUENTLY MAINTAINING A CONSTANT RATIO BETWEEN THE AIR FLOW AND THE LIQUID NITROGEN REFLUX BY ADDING LIQUID NITROGEN FROM SAID RESERVE TO THE LIQUID NITROGEN REFLUX WHEN LESS THAN THE REGULAR PRODUCTION OF LIQUID OXYGEN IS BEING GASIFIED.
Claim 2
Dependent Claim
101 words
IN AN AIR SEPARATION PROCESS WHICH PRODUCES LIQUID OXYGEN FROM AIR USING LIQUID NITROGEN REFLUX AND THEN PUMPS AND GASIFIED LIQUID OXYGEN TO HIGH PRESSURE BY HEAT EXCHANGE WITH A PROCESS STREAM, THE IMPROVEMENT WHICH COMPRISES UTILIZING THE REFRIGERATION RECOVERED IN GASIFYING MORE THAN THE REGULAR PRODUCTION OF LIQUID OXYGEN WHICH IS TO BE GASIFIED TO PRODUCE A RESERVE OF LIQUID NITROGEN AND SUBSEQUENTLY MAINTAINING A CONSTANT RATIO BETWEEN THE AIR FLOW AND THE LIQUID NITROGEN REFLUX BY ADDING LIQUID NITROGEN FROM SAID RESERVE TO THE LIQUID NITROGEN REFLUX WHEN LESS THAN THE REGULAR PRODUCTION OF LIQUID OXYGEN IS BEING GASIFIED.
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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) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |