US2534274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractional distillation
Assignee: Lummus Technology LLC
•
Filing: 1947-01-28
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Granted: 1950-12-19
•
Expires: 1967-01-28
Abstract
No abstract record available.
Inventors
- 👤 Kniel Ludwig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:44
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/14; B01D3/32; B01D3/322
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN THE OPERATION OF A FRACTIONATING COLUMN WHEREIN DIFFERENT TEMPERATURES ARE MAINTAINED IN SEPARATED ZONES WITHIN SAID COLUMN BY REMOVING HEAT FROM AN OVERHEAD FRACTION AND ADDING HEAT TO A LIQUID IN THE BOTTOM OF THE COLUMN, THE STEPS OF CONDENSING SUBSTANTIALLY ALL OF A STREAM OF A GASEOUS REFRIGERANT BY INDIRECT HEAT EXCHANGE WITH THE LIQUID IN THE BOTTOM OF THE COLUMN, VAPORIZING SAID CONDENSED REFRIGERANT IN INDIRECT HEAT EXCHANGE WITH THE OVERHEAD FRACITON; COMPRESSING SAID VAPORIZED REFRIGERANT; RETURNING SAID COMPRESSED REFRIGERANT TO SAID FIRST HEAT EXCHANGE STEP; AND VAPORIZING A PART OF SAID
Claim 2
Dependent Claim
95 words
IN THE OPERATION OF A FRACTIONATING COLUMN WHEREIN DIFFERENT TEMPERATURES ARE MAINTAINED IN SEPARATED ZONES WITHIN SAID COLUMN BY REMOVING HEAT FROM AN OVERHEAD FRACTION AND ADDING HEAT TO A LIQUID IN THE BOTTOM OF THE COLUMN, THE STEPS OF CONDENSING SUBSTANTIALLY ALL OF A STREAM OF A GASEOUS REFRIGERANT BY INDIRECT HEAT EXCHANGE WITH THE LIQUID IN THE BOTTOM OF THE COLUMN, VAPORIZING SAID CONDENSED REFRIGERANT IN INDIRECT HEAT EXCHANGE WITH THE OVERHEAD FRACITON; COMPRESSING SAID VAPORIZED REFRIGERANT; RETURNING SAID COMPRESSED REFRIGERANT TO SAID FIRST HEAT EXCHANGE STEP; AND VAPORIZING A PART OF SAID
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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) | 1953-12-18 | 1954-06-19 | 1954-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-18 | 1958-06-19 | 1958-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-18 | 1962-06-19 | 1962-12-19 | $7700.00 | Window Closed / Lapsed |