US2550679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air fractionating column and process of operating same
Assignee: Hydrocarbon Research Inc
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Filing: 1947-12-29
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Granted: 1951-05-01
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Expires: 1967-12-29
Abstract
No abstract record available.
Inventors
- 👤 Edward G Engel
- 👤 John A Hufnagel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:55
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/04; Y; Y10; Y10S; Y10S62/00; Y10S62/902; Y10S62/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN A PROCESS OF PRODUCING OXYGEN BY THE LIQUEFACTION AND RECTIFICATION OF AIR INVOLVING THE MAINTENANCE IN A VESSEL OF A BODY OF LIQUID OXYGEN CONTAINING ACETYLENE AND THE BOILING OF SAID BODY TO PRODUCE VAPORS PASSED IN COUNTERCURRENT FLOW TO A DESCENDINGSTREAM OF REFLUX LIQUID OXYGEN THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY WETTING WITH SAID REFLUX ALL OF THE WALLS OF THE VESSEL IN THE REGION WHERE THE SURFACE OF SAID BODY OF LIQUID OXYGEN CONTAINING ACETYLENE CONTACTS SAID WALLS TO PREVENT ACCUMULATION OF ACETYLENE ON SAID WALLS.
Claim 2
Dependent Claim
88 words
IN A PROCESS OF PRODUCING OXYGEN BY THE LIQUEFACTION AND RECTIFICATION OF AIR INVOLVING THE MAINTENANCE IN A VESSEL OF A BODY OF LIQUID OXYGEN CONTAINING ACETYLENE AND THE BOILING OF SAID BODY TO PRODUCE VAPORS PASSED IN COUNTERCURRENT FLOW TO A DESCENDINGSTREAM OF REFLUX LIQUID OXYGEN THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY WETTING WITH SAID REFLUX ALL OF THE WALLS OF THE VESSEL IN THE REGION WHERE THE SURFACE OF SAID BODY OF LIQUID OXYGEN CONTAINING ACETYLENE CONTACTS SAID WALLS TO PREVENT ACCUMULATION OF ACETYLENE ON SAID WALLS.
References Cited (Backward Citations)
US1501415A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |