US3751933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of air separation into oxygen and argon
Assignee: Individual
•
Filing: 1971-07-15
•
Granted: 1973-08-14
•
Expires: 1991-07-15
Abstract
Abstract A method of air separation into oxygen and argon in double rectification columns with the drawing off of liquid or gaseous oxygen and simultaneous obtaining of argon by withdrawing a fraction of raw argon from one of the plates of the upper rectifying column, with a portion of the liquid oxygen flow being returned to said rectifying column onto a plate thereof that is located below the raw argon fraction withdrawal zone, whereby a forced circulation flow of liquid oxygen is created.
Inventors
- 👤 S Misarenko
- 👤 L Tsitrin
- 👤 E Borzenko
- 👤 G Golovko
- 👤 V Boiko
- 👤 V Malchenko
- 👤 G Balabaev
- 👤 B Tolstogo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:19
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; F25J2200/00; F25J2200/90; F25J2200/92; F25J2235/00; F25J2235/50; F25J2245/00; F25J2245/50; Y; Y10; Y10S; Y10S62/00; Y10S62/923; Y10S62/924
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |